The Summer Introduction Programme 2015 welcomes about 1600 international students who follow an obligatory programme. Throughout a week of project work students design a water rocket and an academic poster, get familiarized with the Delft study method, and working in multicultural groups. In our project team, Amsterdam 2, we designed a water rocket based on the following design principles: ● aerodynamic design of the rocket ● lightness ● efficient and practical construction Innovative solutions included, sustainability was considered: ● recyclable materials ● parachute system and robust structure make rocket reusable ● environmental friendly (pressurized water is used instead of fuel) ● pleasant scent We learnt how to interact with other international students and how to delegate different tasks depending on each person's skill set. The above mentioned experienced we gained will be useful in our studies.