The IASC Reference group on Mental Health and Psychosocial Support 4Ws tool is developed to map MHPSS activities in humanitarian settings across sectors. It is envisioned that this tool will be used by groups with MHPSS coordination responsibilities in emergencies with numerous MHPSS actors. The tool exists of 2 parts: (a) A manual, which describes how to collect the data. (b) A 4Ws Data Collection Spreadsheet application (in Excel).