There are major challenges of conducting evaluations in humanitarian crises such as natural disasters and armed conflicts. however evaluation is a vital tool for improving current psychosocial programs as well as future planning, programming and decision-making. evaluation provides the means to improve program performance, identify potential unintended negative consequences and build inter-agency consensus on good and promising practices. essentially, the wider impact of well-documented, reliable evaluations will be the building of a stronger knowledge base for effective psycho- social practice.