Selecting a measurement strategy for the assessment of the mental health and psychosocial wellbeing of children in humanitarian emergencies requires careful consideration of a number of issues. This compendium lists 48 measures and approaches that have been used in such contexts, and provides details of each to assist in their selection. A decision-making guide – in the form of a flow chart – is provided at the end of the compendium to assist the process of matching the measurement approach to context and requirements.