Evaluating tangible user interfaces is challenging. Despite the wealth of research describing the design of tangible systems, there is little empirical evidence highlighting the benefits they can confer. This paper presents a toolkit that logs the manipulation of tangible objects as a step towards creating specific empirical methods for the study of tangible systems. The paper argues that the data derived from toolkit can be used in three ways. Firstly: to compare tangible interaction with other interaction paradigms. Secondly: to compare among different tangible interfaces performing the same tasks. Thirdly: via integration into a structured design process. This paper focuses on this last topic and discusses how detailed data regarding object use the data could be integrated into classifications and frameworks such as the Shaer's et al's TAC paradigm.