Construction planning often involves comparing multiple execution scenarios to identify the most effective approach. In practice, this process relies heavily on the planner’s experience and intuition, making decisions difficult to substantiate. This study addresses the question: “How can construction planning scenarios of high-rise apartment buildings (<70m) be effectively compared to support data-driven decision-making in the Netherlands?” Using the Design Science Research method, the study investigates the challenges planners face and explores how construction scenarios can be evaluated more systematically. The aim is to develop a framework and design a tool that supports holistic, effective, and data-driven comparisons of construction scenarios.
Through a literature review and 13 practitioner interviews, six key factors were identified as essential for scenario comparison. These include cost, time, resources, risk, sustainability, and cash flow. These factors and their methods of incorporation were included in the framework. A decision-support tool was designed to operationalise the framework. It largely automates the comparison process, incorporates familiar visualisations, and allows planners to input project-specific scenarios. To improve comparability, the tool applies two optimisations: crane allocation (resource-based) and float-based task shifting (technique-based). Each scenario is evaluated under near-optimal conditions using a full, or rule-based, exhaustive search, reducing inefficiencies and focusing comparisons on strategic differences. Validation showed the tool aligned with planners’ working methods and mostly improved the speed and quality of scenario analysis.
The research demonstrates that the developed framework and tool improve scenario comparison by supporting quick, transparent, well-substantiated decisions. Optimisation ensures fair comparisons, and the use of familiar visuals improves usability and communication. Further development and real-world application are recommended to refine the tool and increase adoption. Future research is based on the limitations and could extend the approach to other project types, phases, or stakeholders.

This thesis investigates how the management of interdependencies between the client and the contractor can enhance risk mitigation strategies in complex construction projects. In practice, many risks do not originate from isolated technical failures, but from misaligned responsibilities, conflicting goals, and a lack of coordination between project stakeholders. These interdependencies influence how decisions are made, how risks propagate, and how effective mitigation strategies ultimately are. While traditional risk management approaches focus on identification and responsing on risks, they often overlook the systemic nature of interdependencies that shape project outcomes.

To address this gap, the research combines two theoretical models to develop a structured framework. The TOE framework is used to categorise the cause and manifestation of complexity into technical, organisational, and external sources, while Perrow’s Normal Accident Theory is applied to assess the level of coupling and interaction between these components. This dual approach allows for a detailed analysis of how different types of interdependencies affect risk exposure and governance needs.

The framework is applied in two completed infrastructure projects through a mixed-methods approach, combining cash flow analysis, project documentation review, and semi-structured interviews. Six key events were identified and analysed to assess how interdependencies were managed in practice and which governance structures were applied.

The findings show that clients typically rely on centralised governance structures focused on control and compliance, whereas contractors operate in more dynamic conditions that require flexible, decentralised responses. This structural misalignment often leads to delays, decision-making bottlenecks, and reactive risk management. Although hybrid governance was not explicitly implemented in the studied cases, the analysis suggests that such an approach could offer a promising solution. By combining strategic oversight with operational flexibility, hybrid governance would allow both parties to respond more effectively to complexity, better align their roles and responsibilities, and improve the overall quality of risk mitigation.

The thesis concludes that aligning governance models with the specific interdependency profile of a project leads to better risk management. It recommends early joint classification of interdependencies, broader stakeholder involvement in decision-making, and the use of trust-based mechanisms to complement contractual controls. These strategies can help project teams respond more effectively to complexity, interdependency and improve overall project performance.

In recent years, there has been a growing interest in the potential of digitalisation to enhance dispute resolution practices in construction projects. Research highlights that the social aspect is an important element in both the successful implementation of dispute resolution methods and the adoption of digital technologies in the construction industry. Culture has the ability to influence this social dimension, shaping behaviours and practices. However, insufficient research has examined the extent to which culture influences the successful implementation of digital technologies in dispute resolution. While most of the existing literature focuses on dispute resolution and digital tools in the context of mega projects, small-scale projects constitute a vital part of the construction industry. Currently, there is a gap in knowledge on how culture influences the successful implementation of digitalisation of dispute resolution in small-scale projects.

The research question that links to this problem is formulated as follows: 'How can culture shape digital dispute resolution practices?'

This thesis discusses an extensive literature review on the concepts of culture and digital dispute resolution, and presents the results of a case study comparing perceptions about digitalised dispute resolution practices in an English and Dutch office fit-out project. Stakeholders within the projects were interviewed for this study, followed by a qualitative content analysis of the interview transcripts to identify cultural issues shaping digital dispute resolution practices. External validation of the analysis took place through an expert panel review. The findings show that culture affects the extend to which digital technologies can be used in dispute resolution and that the cultural position of a project team should be determined to ensure successful implementation of digitalisation to effectively improve dispute resolution practices.

One of the challenges in modern ports is upgrading existing quay walls. Dutch contractor Hakkers BV has developed a device to install underwater grout anchors as a support for sheet pile walls. This technology was successfully tested during a pilot project in the Seinehaven for the Port of Rotterdam. Now they are curious whether underwater grout anchors can also be applied on combi-walls.

“The objective of this thesis is the design of an underwater anchoring system for combi-walls to enable the deepening of existing quays.”

For the design, the case study of the Afrikahaven was chosen. This project has a common type of combi-wall and therefore the design is applicable in many situations. There is currently no specific customer for the quay. The underwater anchoring system can be part of an upgrade proposal in case a customer is interested in deepening the bed level.

Because underwater grout anchoring of combi-walls was only a conceptual idea, this thesis carried out a full design process starting with the very basics. This was done by creating multiple concepts which varied the way of load transfer to the combi-wall. A multi criteria analysis resulted in the selection of two optimal concepts. These two concepts are designs where the anchors go through the sheet piles and are connected to a support structure that transfers the anchor forces to the king piles. These concept designs scored very well on the criteria for hole weakening and spatial usage. Hole weakening of the king piles was a major concern due to the capacity reduction at the locations of the largest moment distribution. By not placing the anchor through the king pile, its capacity does not need to be reduced. Additionally both concepts have limited protrusion outside the combi-wall system. This prevents conflicts with the mooring vessels.

For the two concepts various connection designs have been explored, including rubber connections, clamping connections, extendable connections, and conventional methods such as welding. After evaluating the pros and cons of each design, clamping connections emerged as the optimal solution.

A detailed design of the overall stability of the combi-wall was calculated using D-Sheet. The current situation is used as the starting point. Various positions and angles of the anchors where tested. Eventually the anchor was placed at -11m NAP at the location of the maximum moment distribution. It was essential to place the anchor at a relatively shallow angle to meet vertical stability requirements.

A critical part in the design was underwater anchor failure. An important finding is that the applicability of the current design standards used for anchor design is rather limited for underwater anchoring systems. Without considering the extent of redistribution, it is possible to create a structurally questionable design that still meets the common used standards. Therefore, it is important to thoroughly understand these standards and adapt their implementation if necessary for the design.

Evaluating the extent of force redistribution is crucial for determining anchor forces and stresses in the waling beam and king piles. To evaluate force redistribution, the design was modeled in SCIA
and calibrated using D-Sheet calculations focusing on deformations and anchor forces. The analysis revealed that force distribution depends heavily on the stiffness of the support structure. An overly flexible structure channels excessive force to upper anchors and increasing soil mobilization, while an overly stiff fixed structure risks a chain reaction of failures in adjecent anchors could occur. For the design, a CHF350x500 profile was chosen between the king piles with a moment-free connection. This allows for a redistribution of 40% of the forces to adjacent anchors. The remaining 60% of the anchor forces are absorbed by the four anchors at the top of the two king piles.

To ensure feasibility, understanding construction tolerances is crucial. The design accounted for king pile and sheet pile deformations, with a deformation allowance of 100 mm for the sheet pile. Minor deviations due to ovalization were also considered. While it is unrealistic to address all uncertainties in a single design, using a multi-beam survey to measure the quay wall with 1 mm accuracy is recommended. This approach cannot eliminate construction tolerances but helps mitigate unexpected conditions during installation by incorporating them in the design phase.

The clamping design is based on a support structure where the anchor will be supported in the waling beam. The waling beam will transfer the horizontal forces to the king piles. To avoid underwater welding, a semi-clamp has been designed. These clamps can be connected using four bolts, which can be tightened underwater easily because the system is not yet under tension. Only after pre-stressing the anchor, the clamps will be drawn tightly around the king pile. Vertical stability will be provided by steel cables, which will be attached to the capping beam where the vertical forces will be transfered to the king piles.

To ensure constructability, various components are adjustable. For instance, the waling beam can be cut to size above water and welded between two end plates. An extendable HDPE tube is incorporated into the waling beam to accommodate deformations of the sheet pile wall. Additionally, the radius of the clamps has been slightly enlarged to account for ovalization deformation. This design aims to minimize operations underwater and be construction tolerance proof.

The design makes it possible to deepen the existing combi-wall in the Afrikahaven by 1.5 meters. This enables an upgrade without requiring drastic changes to the quay. The proposed design is applicable to all similar combi-wall configurations. However, for each project, specific construction tolerances must be reassessed, and the redistribution of forces during anchor failure must also be evaluated.

This research addresses the challenge of standardising and integrating information from laboratory tests in pavement engineering to enhance lifetime predictions. Data from laboratory tests is often scattered across various platforms, stored in disparate formats, and described using inconsistent terminologies. This fragmentation poses significant challenges in data sharing, retrieval, and interpretation, leading to inefficiencies and potential errors. The objective is to develop a comprehensive ontology that organises and connects extensive laboratory data from the Knowledge-based Pavement Engineering (KPE) project. This framework aims to facilitate enhanced data interoperability, retrieval, and application, thereby contributing to more efficient and effective pavement design, construction, and maintenance practices. This objective leads to the main research question: “How to effectively standardise and integrate laboratory information in pavement engineering to enhance lifetime predictions?”

The development of the ontology follows a structured methodology involving several steps. The process begins with identifying relevant stakeholders, such as pavement researchers, road owners, contractors, and third parties, and to understand their specific objectives and requirements. Following this, competency questions are formulated to define the scope and functional requirements of the ontology. These questions help in identifying the necessary classes, attributes, and relations within the ontology. The subsequent step involves specifying the structural requirements, followed by showing the alignments with the existing Dutch standard. This structured methodology ensures that the developed ontology is comprehensive, addresses the stakeholders' needs, and utilises existing knowledge.

The Lab Ontology focuses on standardising and structuring laboratory data related to pavement engineering. It categorises key concepts such as laboratory instrument, testing conditions, sample properties, and their relations. By establishing clear definitions and relations, the ontology enhances data consistency, comparability, and interoperability. Ultimately, the Lab Ontology answers the main research question by providing a standardised framework that improves data sharing and enhances decision-making processes in pavement engineering. This framework can significantly contribute to improving the lifetime predictions of pavement materials.

Climate change is one of the most urgent global issues, with the construction sector contributing nearly 11% of global CO2 emissions. Cross-laminated timber (CLT), is proposed as a sustainable alternative for concrete and steel that, can reduce carbon emissions. The primary objectives are to identify the main drivers and barriers to using CLT in multi-storey buildings in the Netherlands and to propose strategies to overcome these barriers. The results indicate that timber’s natural ability to store captured carbon dioxide was the most important driver. Besides, CLT's lightweight nature allows for precise, modular prefabrication in factories, enabling quick and safe on-site assembly.

The biggest barriers are related to financial and political aspects, but also to technical and sociocultural aspects. Some of the regulatory barriers are CLT’s unfair representation in the MPG system and its incompatibility with building codes. Additionally, CLT is oftentimes more expensive than concrete and steel, making it less attractive. Moreover, there is still till some extent a lack of knowledge and experience across the AEC industry regarding CLT, leading to perceptions of risk and reluctance to adopt it. Some of the technical challenges are related to fire-safety, acoustics, moisture, and connections.

Five sets of strategies have been developed to overcome the aforementioned barriers. The first set of strategies is aimed at increasing industry-wide knowledge and awareness on CLT. The second set of strategies is focused on changing the industry by promoting collaboration and reorganizing the timber supply chain. The third set of strategies addresses the cost barriers by offering new financial models to overcome the cost surplus of CLT construction. The fourth category is focused on overcoming technical barriers by making technical advancements like improvements and innovations in prefabricated systems and increased standardisation. The last set of strategies is aimed at addressing regulatory barriers. Strategies include revising the MPG system to better account for biogenic carbon storage, expanding the national environmental database to include more timber products, establishing building codes that support timber construction, and setting timber building quotas.

This thesis investigates the role of external stakeholder management in fostering resilience within infra-structure projects, focusing on the complexities arising from interactions between stakeholders and pro-ject organizations. The research problem centres on how different stakeholder management strategies affect project resilience, especially in challenging environments.

To address this problem, a qualitative single-case study methodology was used, examining the "Tunel Diamante" project in Acapulco, Mexico. This approach allowed for an in-depth exploration of 26 events involving external stakeholders, such as government entities and landowners, to determine how their influence strategies and the project’s responses affect project resilience.

From the analysis, the thesis identified three primary traditional influence strategies employed by ex-ternal stakeholders: 'progress obstruction,' 'protest,' and 'demand for compromise.' Additionally, it in-troduced two innovative categories: 'collateral events' and 'proactive mitigation.' These latter strategies indicate a broader and more nuanced understanding of stakeholder influence.

The project adopted four response strategies: resourcefulness, dialogue and negotiation, coercive nego-tiation, and ignoring. These influenced the type of resilience, from absorptive to adaptive and trans-formative. Resourcefulness, characterised by adaptability, was linked to all types of resilience, while dia-logue and negotiation generally led to absorptive resilience. Coercive negotiation had mixed results, raising ethical concerns.

The findings suggest that stakeholder management strategies can significantly impact project resilience but may involve trade-offs and ethical considerations. This thesis contributes to the discourse on resili-ence in project management and offers practical insights into how external stakeholder management strategies shape resilience. It concludes that proactive and ethical stakeholder management is crucial for achieving sustainable project resilience, emphasising the importance of engaging stakeholders early and addressing their concerns constructively.

This thesis aims to design an interactive tool that facilitates collaboration between Microsoft’s teams in the datacenter development design process. Current datacenter development strategies of Microsoft do not sufficiently take into account socio-technical aspects which is causing project delays. Such socio-technical aspects are internally represented by different teams at Microsoft, such as the Community Affairs team and the Environmental team. Incorporating the preferences of all the relevant teams during the design, results in enhanced collaboration through increased mutual insights, which can be used to develop new design solutions. Such new design solutions inherently incorporate more socio-technical aspects...

The current Dutch infrastructure construction market faces various challenges in renovations and sustainability, while the global context shows its volatility. The rising construction demand strengthens the contractors’ bargaining power, while they previously had to be (over-)accommodating towards the client to stay in business. Bad experiences from the past and the complexity of larger projects require a new approach to collaboration between (public) clients and contractors. Attention to the equitability of risk allocation can be a first step towards improvement. This topic is studied by analysing literature and five recent rail construction case study projects between Van Hattum & Blankevoort (contractor) and ProRail (public client), as well as interviewing practitioners. This research has aimed to create a risk allocation equitability assessment framework for construction projects to define, apply, evaluate, and improve risk allocation equitability in this context.

Combining several justice and responsibility theories provides a theoretical overview of the concept of equitability. This distinguishes distributional, procedural, interpersonal, and informational factors. Additionally, it considers contexts, collaboration, experiences, and expectations. Comparing the theoretical with practice shows that not all of these are relevant or (explicitly) applied by practitioners. The use of model agreements, such as the UAC-IC2005, is very influential in defining, applying, and experiencing equitability. As a result, the relevance of primarily distributional factors and contexts is affected. And although the UAC-IC2005 can serve as a benchmark and indicator for equitability, it cannot cover all factors practitioners experience as relevant for equitability. Therefore, this study has identified two points during the risk allocation process in construction projects when equitability is best assessed. A list of questions to assess relevant factors is provided. The scoring of these questions can be translated into a scoring of nine categories and plotted on a heatmap. This provides a comprehensive overview of how equitability is perceived and where attention is required.

Unfortunately, it is concluded that the perception of equitability is too subjective and multi-faceted to absolutely and undisputedly define, apply, and evaluate equitability. However, the findings also show that the question of equitability can, therefore, be neglected. The assessment framework drawn up in this study can provide a better understanding of what constitutes to equitability perception, a measure to identify equitability issues, and a guide to starting and directing discussions on this topic. Although the framework has, to some extent, been validated by contractor practitioners, it is recommended that this be repeated with the client’s side and that the framework be applied and evaluated to real-world projects. Furthermore, a quantitative approach to the topic and variation of the scope could deepen the understanding of equitability.

Among the most recent demands in the construction industry, is the implementation of the Building Information Modelling (BIM) methodology to deliver integrated designs. The BIM workflow emphasizes detecting design conflicts early, increasing the early stage design effort while minimizing later-stage costs and delays. However, the current BIM workflow lacks a formal structure for prioritizing, escalating, and resolving issues identified during iterative design cycles. This challenge becomes more pronounced in complex projects where multiple disciplines interact simultaneously. The absence of a structured issue management approach leads to informal and uncoordinated issue resolution, making it difficult to track and prioritize issues effectively, decreasing the efficiency during design phase.
This research explores how Risk Management (RM) principles can support BIM workflows to
improve project results, with a specific focus on issue management. By analysing existing gaps
and inefficiencies in BIM issue management, the study develops a framework that integrates RM concepts. The aim is to enhance the ability of BIM processes to systematically prioritize, escalate, and address issues.
The result of the research is a conceptual risk management-based issue management framework, developed through a combination of literature review, practical insights, and the application of socio-technical theory. This framework incorporates an iterative process for detecting, filtering, and prioritizing BIM issues based on risk criteria. It spans the design phase, offering a structured roadmap for implementation that considers stakeholder communication and resource optimization. Risk management addresses deficiencies in issue management through an integrated framework that guides the process based on RM principles. This integration has significant implications for issue management and requires a top-down, step-by-step approach. The integration of this framework is presented in steps to achieve understanding and sense of usefulness among different stakeholders.

Building Information Modelling (BIM) has emerged as a transformative technology in the Architecture, Engineering, and Construction (AEC) industry, offering significant potential for improving project efficiency, collaboration, and transparency. However, its adoption in post-Soviet countries, particularly within the Commonwealth of Independent States (CIS), remains limited due to a range of socio-technical, organizational, and regulatory challenges. This research investigates the primary barriers faced by Building Client Organizations (BCO) in the CIS region when adopting and implementing BIM. The study also examines the role of Design-Engineering Organizations (DEO) in supporting BCO during this digital transition.
The research follows a qualitative methodology, combining semi-structured interviews with professionals from a design-engineering company and document analysis of BIM Execution Plans (BEP) and Employer's Information Requirements (EIR). Four interviews were conducted with industry experts who were involved in BIM projects in the CIS region. This data was analyzed using selective coding to identify key challenges and strategies for overcoming these barriers. Additionally, the research employed document analysis to validate the insights from interviews and to provide context for the identified challenges.
The study proposes a comprehensive change framework to address the identified challenges in BIM adoption. The framework emphasizes the need for enhanced collaboration between BCO and DEO, with a focus on standardizing processes, improving client education, and aligning expectations. It integrates change management models, such as Kotter's 8-Step Change Model and the ADKAR model, to guide organizations through the digital transformation process. This framework aims to address technical barriers, such as interoperability and data standardization, while also fostering cultural and organizational shifts needed to overcome resistance to change and low client engagement.
Despite the limitation of a small sample size and validation from one organization, the research contributes valuable insights due to the expertise of the participants and the lack of existing studies focused on BIM adoption in the CIS region. The findings provide practical recommendations for advancing BIM implementation in this context, contributing to the broader body of knowledge on BIM adoption in transitioning economies.

The infrastructure of the Netherlands is mostly built in the 1950s and 1960s and is approaching the end of its theoretical lifespan of 80 to 100 years. Due to more intensive use and increased traffic loads many bridges need to be renovated or replaced. National and regional infrastructure managers, such as Rijkswaterstaat, ProRail, provinces, municipalities, and regional water authorities, are tasked with managing these assets with an estimated replacement and renovation cost of 170 billion euros until 2100, potentially reaching 260 billion euros. To first get an insight however into the state of the bridges in the Netherlands, these bridges need to be constructively recalculated.
This research considers practical challenges and solutions related to knowledge management within an inter-organisational programmatic approach for the replacement and renovation of bridges in the Netherlands. This research therefore considers the 'bureau herberekeningen': a recalculation programme organised by Rijkswaterstaat in which ten engineering firms are involved for the recalculations of more than 250 steel, concrete, and moveable bridges. This research aims to inform on what a programmatic approach can consist of, identify possible challenges related to knowledge management in an inter-organisational programmatic approach, and advice on overcoming these challenges.
A literature study was conducted on three topics: the programmatic approach, knowledge management, and inter-organisational collaboration. The programmatic approach is defined as a combination of related projects managed together to achieve benefits and objectives that cannot be obtained by individual projects. The organisation of a program must consider the interrelation of projects, their characteristics, and the nature of the involved organisations. This results in the need for a programme management office for governance and adaptation. Knowledge management at the programme level involves organising activities and systems to facilitate the identification, storage, retrieval, sharing, and use of knowledge, incorporating both social and codified approaches. Network governance is recommended to support the relations in inter-organisational collaboration, focusing on relationships between programme and project managers, the programme and organisational strategy, and among individual projects, while considering the importance of trust, communication, and collaboration.
The empirical study, conducted in collaboration with the Dutch engineering firm Witteveen+Bos, reveals several critical insights. Key challenges include the need for improved collaboration and communication, overcoming competitive barriers to knowledge sharing, and ensuring efficient and less detailed assignment descriptions to maintain project momentum. The study also highlights the importance of fostering a culture of openness, reciprocity, and trust among involved parties to facilitate effective knowledge management.
The findings suggest that the programmatic approach, when combined with knowledge management, can significantly improve the efficiency and effectiveness of recalculations. Recommendations include using technical assessments between engineering firms for knowledge sharing, organising regular collaboration days, and ensuring the pace and bundling of project assignments to make optimal use of the relations between projects.

Digital Twin (DT) technology has transformed construction by creating virtual counterparts of real-world objects for improved project design and management. Integrating Building Information Modelling (BIM) with Game Engines (GEs) like Unity3D is crucial for effective DT implementation in construction. However, research in this area is limited, particularly in seamless BIM data exchange to GEs. This study bridges these gaps to enable successful DT deployment in construction.

This research addresses BIM-GE integration for construction DTs, evaluating commercial, customized and custom built data exchange methods between Autodesk Revit and Unity3D. Drawing from literature and commercial software, the methods are tailored to diverse DT use cases. The goal is to optimize workflows, enhancing efficiency and accuracy of data transmission between DTs implementing technologies. Findings provide guidance for seamless BIM-GE integration, fostering innovative and sustainable infrastructure.

Comprising four branches, the methodology involves a literature review to establish data needs for various DT applications, software pipeline evaluation, comparative analysis of data exchange methods, and prototyping using Dynamo.

Key findings include insights into DT use case requirements, analysis of data exchange method pros and cons, recommendations for DT development, and a practical prototype illustrating data exchange.

In conclusion, strategies for effective data exchange are highlighted, including bi-directional methods and real-time synchronization. Recommendations involve suitable file formats and polygon reduction techniques. Embracing emerging technologies like object behavior and sensor data enhances DT simulations. This research demonstrates how the DT use case influences the type of data need and therefore highly affects the data exchange methods to be considered when developing a DT.

Changes in the climate have forced municipalities to rethink urban development and become more climate-resilient. One way they can achieve this is by implementing Sustainable Urban Drainage Systems, or SUDS. Permeable pavements are a type of SUDS designed to let rainwater infiltrate, thereby reducing runoff and lowering peak flows. They can be used to mitigate climate change effects. Municipalities have slowly started implementing permeable pavements into their projects on a small
scale, but numerous barriers still stand in the way of widespread implementation. Various barriers are related to information sharing.

This thesis aimed to improve the innovation implementation process by examining information sharing between municipalities and companies. Grass concrete pavements, or green parking, was chosen as a case study, a relatively new permeable pavement system using open pavers, substrate, and a mix of grass seeds to allow precipitation to infiltrate while adding green to urban areas. Three main flows of information were considered: between companies and municipalities, between different departments within the same municipality, and between municipalities and other levels of government. Interviews were conducted with interviewees in various roles from both companies and
municipalities involved in the process of innovation implementation.

A network of various factors was formed, with three key issues:
• A lack of consensus on what a successful project should be.
• Uncertainty about responsibility leading to a situation where the implementation of green parking
is dependent on the motivation of individuals.
• Pilot projects are conducted by municipalities without clear goals, therefore, producing no results that can be analyzed or used for upscaling.

The second part of the thesis involved further analysis of the three key issues. Multiple recommendations for municipalities and companies were formulated. Recommendations for conducting successful pilot projects are also provided and are applicable to both green parking as well as other innovations. For municipalities, the recommendations are to make responsibilities clear, perform a life cycle cost analysis, set clear and concrete goals in their climate adaptation strategy, share successful experiences, and create a step-by-step guide for innovations to become standardized. These recommendations are mainly aimed at green parking but will also benefit the implementation of other innovations.
For companies, the recommendations are to create realistic expectations, convince the water board of the water storage capacity of the system, and conduct further research into optimizing maintenance plans. These recommendations are mainly aimed at green parking and Sustainable Urban Drainage Systems (SUDS). For pilot projects, the recommendations are to reach a consensus on what defines a success beforehand, set realistic goals and start small, include a follow-up plan, find partner municipalities to collaborate with, and find a balance between intensive and superficial monitoring. The results from this thesis consisted of concrete recommendations for both municipalities and companies to improve the innovation implementation process. Furthermore, the results can be a starting point for more profound research into information sharing and how it relates to innovation implementation. This can include testing the recommendations at a municipality to optimize the process, like setting up a pilot program or expanding the climate adaptation strategy.

The construction sector plays a significant role in the environment, and concrete structures constitute a substantial portion of this sector. The government is actively seeking ways to reduce the environmental impact of construction activities by promoting a more sustainable approach. In the Netherlands, a considerable number of repetitive cellular residential buildings are constructed using the tunnel formwork building method. Although this method can be enhanced in terms of sustainability by utilizing environmentally friendly cement mixtures, it poses challenges, such as an increase in execution time. This research aims to explore a more sustainable approach to the tunnel formwork building method while devising strategies to maintain the same execution time as before.

The tunnel formwork building method operates with a 24-hour daily execution cycle. During the initial 8 hours, the formwork, reinforcement, and installations are set up, followed by pouring concrete at the end of the day. After 16 hours, the concrete attains sufficient strength for the formwork to be dismantled, allowing it to be placed on the next grid. This approach results in rapid construction, high-quality output, and cost-effectiveness. However, a significant drawback is the reliance on CEM I mixtures, which consist of approximately 100\% Portland cement, contributing to substantial greenhouse gas emissions and environmental impact. Blended cement mixtures, such as CEM II and CEM III, offer more environmentally friendly alternatives by incorporating lower percentages of Portland cement blended with fly ash or blast furnace slag. Despite their environmental benefits, these mixtures exhibit a slower strength development, making it challenging to achieve a hardening time of 16 hours.

In pursuit of a dependable and sustainable approach to the tunnel formwork building method that preserves the 24-hour daily cycle, the research question is articulated as follows: "What concrete mixtures and execution strategies can be applied in the Netherlands to diminish the environmental impact of the traditional tunnel formwork building method, utilizing sustainable cement mixtures, while upholding existing advantages in time, cost, and quality?" This research question will guide the exploration of optimal concrete mixtures and execution measures for implementing sustainable cement mixtures within the tunnel formwork building method, while ensuring the continuity of the daily execution cycle.

In addressing this research question, an Excel calculation sheet has been developed. This sheet serves to compute the material costs, shadow costs, and formwork removal time associated with specific modifications in the design, concrete mixture, and additional execution measures for the tunnel formwork building method. The calculation sheet offers flexibility with three grid sizes: 4.5m, 6.0m, and 7.2m. It incorporates various concrete properties, such as the cement mixture (CEM I, CEM II, or CEM III), w/c ratio (0.45 or 0.55), aggregate types (fine and coarse), Blaine value (300 or 400$m^2/kg$), and admixtures (basic and additional). Additionally, the calculation sheet allows for adjustments in seasonal conditions, with options for summer (20°C) or winter (10°C)...

Equalized involvement of stakeholders in decision-making processes (DMP) allows them to achieve a balanced outcome, when aiming to create value for each participant. However, as the number of stakeholders increases, traditional methods of interactive engagement become more complex, often leading to unbalanced solutions. Identifying such balanced outcomes also becomes more challenging and time-consuming, considering the wide range of potential outcomes. To address this complexity, this thesis introduces a new approach, Preference-based Goal Attainment (PBGA), and develops a tool for its application in DMPs. The PBGA tool facilitates transparent communication of stakeholders' needs, desires, and values within the DMP, helping to bridge satisfaction gaps among various stakeholders and yield an equitable and optimal outcome.

For the development of this tool, a multi-objective optimization framework is proposed. This framework allows stakeholders to integrate their needs, desires, and values as objective functions, with decision parameters represented as variables, in the tool. Crucially, it enables stakeholders to specify preferred states within their objectives, known as preferences. The framework also considers the varying influence of stakeholders by incorporating a weighted goal attainment method. This method focuses on improving the objective with the largest weighted preference deficit in each iteration of the genetic algorithms used in the optimization process.

For testing and validation, the approach is applied to a DMP in a selected case study. Data, including objectives, variables, and stakeholder preferences, are collected through semi-structured interviews, and transformed into a computational format for MATLAB® implementation. The outcomes are verified using the Kolmogorov-Smirnov and Chi-Square comparative methods. Additionally, the tool and its results are validated by stakeholders, ensuring the tool's practicality and acceptance of the new design.

With the PBGA tool, stakeholders can transparently communicate their needs and desires in the DMP and achieve an outcome that involves equal participation from each stakeholder. The thesis concludes with a comprehensive discussion on the practical applications, limitations, and assumptions of the tool, highlighting its potential to improve stakeholder collaboration and decision-making in project management.

This study addresses the critical need for specialized risk identification practices in green retrofit projects within the construction industry, particularly under the increasing pressure to meet the EU's net-zero emissions target by 2050. Focusing on the Netherlands, it investigates how companies navigate the unique challenges posed by updating existing infrastructure to be more sustainable and energy-efficient. Through a mixed-method approach comprising a literature review, field study in Voorburg, and semi-structured interviews with experts, the research identifies distinct risks such as performance risks, supply chain disruptions, and uncertainties in returns on investment. Royal Haskoning DHV's approach, including their Fast-Lane Method, is examined for its effectiveness in predicting energy use but noted for its limitations in estimating carbon emissions and broader retrofit tasks.

The study advocates for an integrated approach utilizing Building Information Modelling (BIM) to enhance risk management and project outcomes. It highlights the gap in current risk management practices that fail to fully address sustainability challenges in retrofits and suggests future research directions, including broader studies involving multiple companies and technologies, to develop more comprehensive risk management strategies for green retrofit projects.