Designing and evaluating tangible interaction is a challenging ad-hoc process. This paper argues that if the field of tangible interaction is to continue to develop, it will need to adopt design methodologies and guidelines that reflect its unique features and constraints. This paper considered theories of embodied cognition as source for guidelines that might be better matched to the development of tangible interaction. It also presents a toolkit to record and present users' interactions with tangible applications, affording systematic comparisons between tangible designs, tangible systems, and between tangible interaction and other interaction paradigms.