Assessing computational thinking in making has proven a challenge, in part because student creations are innately diverse and unique. In this paper we consider portfolios as a way to document and assess students’ learning processes in the context of designing electronic textile (e-textile) projects. We describe students’ use of portfolios at the end of an introductory computing course, Exploring Computer Science, during which 33 students created a series of electronic textile (e-textile) projects as part of a new curricular unit. Our analysis not only illuminates the capability of portfolios