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Despite the widespread occurrence of humanitarian emergencies such as epidemics, earthquakes, droughts, floods and violent conflict and despite the significant financial resources devoted to humanitarian assistance, systematic learning from such interventions using rigorous theory-based impact evaluations is very rare. The objective of this paper is to examine the extent to which scientific impact evaluation methods can provide evidence to improve the effectiveness and efficiency in humanitarian action. This paper explores the methodological options and challenges associated with generating high quality evidence needed to answer key questions about the performance of humanitarian assistance, including whether assistance is reaching the right people, at the right time, is bringing about the desired changes in their lives (effectiveness) and is being delivered in the right doses, ways and with manageable costs (efficiency). With the help of six case studies and drawing on real-life examples from the small but growing academic literature, we demonstrate how impact evaluation methods can be used successfully and in an ethical manner to improve humanitarian assistance. A key lesson from our review is that it pays to be prepared. Much information is being collected these days about the risks of various emergencies unfolding, be they sudden onset or slow onset emergencies. Hence national actors and international donors can prepare for these events and for conducting meaningful impact evaluations. Given the overwhelming needs and the lack of funds, doing more with limited resources is a key challenge for humanitarian assistance and impact evaluation is one way of achieving this.

The overall goal of the report is to increase the capacity of researchers and policy makers to identify comparatively, and across time, how individuals, households and communities are affected by violent conflict. The report provides an extensive overview of existing practices and datasets used in this field of research. We investigate existing methodologies and data-bases used to operationalize the variables of interest and discuss the channels linking violent conflict to individual and household welfare. Special attention is paid to methodological issues on how to design a module and operationalize variables that allow researchers to analyze the welfare effects of violent conflict across countries and across time. We develop and discuss a generic household module that can be easily inserted into future socio-economic surveys implemented in conflict-affected countries. This module will enable researchers to address specific violence-related issues comparatively across different conflict settings and systematically across time. The module proposed builds on previous experiences on survey designs in conflict-affected areas. We review existing conflict- and violence-related questionnaires, with a special focus on World Bank's Living Standard Measurement Surveys (LSMS), and propose suggestions on how to improve questionnaires in order to deepen the understanding of the nature of violent conflict and the channels whereby conflict and violence affect the welfare characteristics and choices of individuals and households in conflict areas.