This file is a support tool for the ACTION impact assessment methodology that you can find here on Zenodo at the following link:https://zenodo.org/record/4432132 In this matrix the reader will find the lists of the variables for each of the impact dimensions conidered. For each vairable it provides suggestions onwho needs to supply the data (project managers and/or citizens scientists/volunteers) and when (only after the project end - ex-post - or also at the beginning of the project- ex-ante). This helps plan the data gathering activities. Then the reader can find examples of questionnaires to be used for several of these dimentiosn/variables here: https://www.zenodo.org/record/3968460#.YKuOqOvOM6g