This master thesis is the report of the graduation project ‘Supporting citizen initiatives - the design of a platform for the neighbourhood budget of the Frederik Hendrikbuurt’ for the municipality of Amsterdam and more specifically the municipal participation innovation team OpenStadsdeel. The report describes the design of a platform that aims to stimulate residents of the Frederik Hendrikbuurt, a neighbourhood located in the west borough of Amsterdam, to start and realise an initiative for the neighbourhood. The neighbourhood budget is a subsidy for the support of citizen initiatives. In some neighbourhoods of the west borough of Amsterdam, including the Frederik Hendrikbuurt, this budget is managed by a neighbourhood agent, a civil servant who is particularly active in a specific neighbourhood, and a neighbourhood committee, a group of volunteering residents. In a bi-monthly meeting they discuss and decide which request for the budget are granted a subsidy. The neighbourhood agent of the Frederik Hendrikbuurt approached OpenStadsdeel with a problem: the neighbourhood budget could be used more widely. Currently, only residents who are aware of the existence of the budget and know how to reach it are using the budget for their initiatives for the neighbourhood. These residents are also referred to as the ‘usual suspects’. The neighbourhood agent, neighbourhood committee and the municipality would like to see more people make use of the budget. A project goal was formulated: Stimulate more residents, other than the ‘usual suspects’, to use the neighbourhood budget for the realisation of initiatives for the Frederik Hendrikbuurt by opening up the process. The project was divided in three phases. In the first phase, named ‘Research’, the involved and (yet) uninvolved stakeholders of the neighbourhood budget in the Frederik Hendrikbuurt were analysed. Interviews, street interviews and a creative session with stakeholders resulted in an overview of stakeholders and their experience of an initiative that is funded by the neighbourhood budget. Residents often did not know about existence of the budget or how to reach it. When an initiator knows about the existence of the budget, requesting it is experienced as a difficult and unclear process. The neighbourhood agent had to spend too much time and energy on guiding initiators through the process of a budget request, which resulted in a lack of time to support initiatives on their content. The neighbourhood committee experienced difficulties in evaluating the requests, because neighbourhood support is hard to estimate and requests are often in- or overcomplete. The research phase was concluded with the formulation of a design goal. A design goal was formulated for all stakeholders individually. These individual goals have as aim to reach an overall design goal: “To stimulate more residents to actively participate for the Frederik Hendrikbuurt, I want to help potential initiators to realise their ideas for the neighbourhood by supporting them at the right moment and connect them to people who can help them.” In the second phase, named ‘Design’, ideas, two creative sessions were organised to generate and select ideas that aim to reach the design goal. The first session was held with stakeholders of the neighbourhood budget. The second session with Industrial Design students and the OpenStadsdeel team. The ideas of a neighbourhood budget competition, online platform and initiative support flyer were selected to develop. In an iterative process of prototyping, testing and designing, the three ideas were developed into a final design. The final design is an online platform where residents can request a budget, find support for their initiative, share and develop ideas for the neighbourhood collectively and share experiences of realised initiatives. The support flyer is tool that is offered by the of the platform and can be used by initiators to find residents who want to support or become involved with an initiatve. The neighbourhood budget competition is an engagement strategy that aims to stimulate residents to start an initiative for their neighbourhood. In the last phase, named ‘Evaluate’, the final design was evaluated with stakeholders of the neighbourhood budget, OpenStadsdeel and the municipality. The stakeholders and client of the project want to launch the platform before the end of 2017. From the evaluation with the developer of OpenStadsdeel it became clear that to reach this deadline, the design has to be simplified. Therefore, recommendations are given in the form of an advice for a minimal viable product and a roadmap, containing a planning for the further development of the platform, is provided.