This paper proposes a method, called DEPTH, for the evaluation of computer supported collaborative learning (CSCL) tools, which is a difficult task. Evaluators need to make an in-depth usability performance analysis of the supported functionality of a CSCL tool according to specific context related usage scenarios. Scenarios are hard to be written. Moreover, it is not easy to find usability experts for specific types/genres of tools. Thus, the main motivational idea for proposing DEPTH, have been: i) to minimize the preparatory phase of a usability evaluation process by reusing inspection scenarios and ii) to assist a novice usability evaluator (one not necessarily familiar with the genre of the CSCL tool) by showing best design practices.