This chapter describes the design of Build in Progress and share four vignettes of young Makers capturing, sharing, and reflecting on their design process using the site. Build in Progress is a platform in which makers share the story of how their DIY projects develop, including the various iterations and experiments that lead to a final design. Documentation and reflection is highly valued in arts, design, and engineering education. It is common practice for both students and professionals in the fields to create portfolios in which they curate documentation of their work. Research around portfolio development has supported their use for identity development and their value for communicative and reflective practice. The philosophy behind documenting work-in-progress has been integral to strategies in arts education, such as the Process-Folio project from Project Zero, in which learners capture their design process in portfolios that are discussed and shared. Internet Monitored Sprinkler System also includes two versions of the design separated into branches.