This report from Retrak provides information on how to best count and develop estimates of the number of street-connected children in a particular area. The report includes an overview of the rationale behind collecting this data, the challenges in collecting this data and in defining “street children,” and the methodologies most suitable for this type of data collection. The report also offers advice on how to engage street children and gain their trust in order to conduct such studies. The report offers suggestions on how to work with limited resources, and how to ensure accuracy and reliability in enumerating street children. The report details specific steps necessary to undertaking an enumeration study, including agreeing on a methodology, defining that methodology, determining the geographic scope and timing, implementing a census, creating an interview instrument, choosing and training data collectors, processing data, and publication of the enumeration results. The report concludes with general recommendations from Retrak.