The increasing centrality of police in peace and capacity building operations suggests that the need for incisive assessments of their impact has never been greater. This means that the manner in which input data is aggregated matters integrally since irrelevant perspectives, such as national trends for a localised program, produce irrelevant, or worse misleading, conclusions. Currently, however, common practice is to rely on either patchy anecdotal evidence of practitioners or the acumen of particular analysts, which invariably reflects their organisational biases. The purpose of this article is to engage this problem – in the context of international policing – so that selecting the most meaningful viewpoints and information is not left to chance. We develop a framework which systematises the many nuanced yet crucial forms of disaggregation for monitoring and evaluation. Assessment analyses informed by this framework can therefore go a long way to achieving their main purpose: ensuring more efficient and effective international policing going forward.