Which characteristics of NGOs are associated with the adoption of modern management practices and to what extent have those practices become standardized? Based on a national sample of 135 international and local NGOs operating in Cambodia, we address these questions by analyzing the dynamics of "monitoring and evaluation" (M&E), a term used to describe a broad range of activities that NGOs undertake to track, understand, and assess their work. We provide an overview of monitoring and evaluation in a developing country setting, investigate the factors associated with more extensive (or sophisticated) M&E using multivariate analysis, and look at how M&E practices vary between local and international NGOs. Findings demonstrate that professionalization, resource dependence, and social embeddedness all play important roles in explaining the activities of NGOs operating in Cambodia. The analysis also suggests that the flow of management practices in the NGO sector differs for local and international actors.