Assessing students' learning of concepts in programming is an essential part of teaching computer science. We developed an assessment activity that measures students' skill in identifying programming structures used to create various behaviors in MIT App Inventor (AI). Called the Tablet Game, the assessment was implemented as interactive app on an Android device. Students interacted with elements on the screen, and then in a multiple-choice format, were asked to select which code-blocks would create those behaviors. We tested the Tablet Game in two week-long app development summer camps held

The ITEST Small Working Group on Computational Thinking (CT) has completed its White Paper titled: Computational Thinking for Youth. The paper aims to describe what computational thinking looks like when practiced by youth in ITEST and other NSF funded programs and how educators can support growth in computational thinking. It shares examples of CT as observed in middle school projects. It also shares observations in the form of a model that describes three stages that youth appear to progress through as their computational thinking skills evolve.