This Technical Brief is for assessment experts, information management officers and information analysts planning or implementing assessments in emergency contexts. It provides guidance on how to select and use suitable methods when conducting a population estimation exercise.This technical brief builds upon the desk review Rapid estimation of affected population figures, which has identified and detailed a broad range of different population estimation methods.

These methods are categorised by sampling methods, site estimation methods,counting methods, remote estimation methods and the usage of existing demographic data. It is recommended to use the above mentioned review as a reference for more in-depth information about the different techniques described in the present document. The present technical brief should be considered as a companion to the review.