The CEFR encourages teachers to resort to task-based activities in the language classroom. However, some resistance has been offered to this approach, due to lack of appropriate training and difficulty in meeting some basic practical conditions, as well as in finding resources and examples of good practices, as shown in a survey conducted within the scope of ETALAGE. PETALL (Pan European Task-based Activities in Language Learning [2013-2016]) seeks to construct a transnational strategy for ICT-based task design management and aims to design tasks that can be implemented in different educational contexts. This paper offers an overview of the internal evaluation procedures to be followed at different levels and stages of the project, and discusses the objectives, underlying principles and criteria applied.