This chapter provides practical guidance to begin preparing pupil-led projects in each school. Teacher teams will first diagnose their school contexts and opportunities (teachers involved, subjects, school ongoing projects, strategic lines, coordination requirements, etc.). Then, they will define and evaluate two possible challenges that will be presented to the pupils later. Finally, the pupils will select the school challenge through a participatory process. The results of this work seek to enhance coordination and participation of teachers and pupils, being the starting point for the next module.