Communicating about computational thinking: understanding affordances of portfolios for assessing high school students’ computational thinking and participation practices
Deborah A. Fields, Debora Lui, Yasmin B. Kafai, Gayithri Jayathirtha, Justice T. Walker, Mia S. Shaw
Abstract
Background and Context: While assessment of computational thinking concepts, practices, and perspectives is at the forefront of K-12 CS education, supporting student communication about computation has received relatively little attention.Objective: To examine the usability of process-based portfolios for capturing students’ communication about their computational practices regarding the process of making electronic textile projects.Method: We examined the portfolios of 248 high school students in 15 introductory CS classrooms from largely underserved communities, using a formal rubric (top-down) to code computational communication and an open-coding scheme (bottom-up) to identify computational practices described.Findings: Students demonstrated stronger abilities to communicate about computation using text than visuals. They also reported under-assessed CT practices like debugging, iterating, and collaborating. Students of experienced e-textile teachers performed substantially better than those with novice e-textile teachers.Implications: Portfolios provide a viable addition to traditional performance or survey assessments and meet a need to promote communication skills.