To measure lasting effects of nonprofit programs, clients must be tracked after they leave services. Information on status at some later point--perhaps 3, 6, 9, or 12 months--is needed to measure outcomes, assess program results, and identify needed improvements. Drawing from lessons learned by community-based nonprofits, the guide offers practical advice on how to collect these data efficiently, successfully, and at reasonable cost. Primarily geared to meet the needs of nonprofit managers and professional social service staff, it offers step-by-step procedures, model materials (including planning tools and feedback forms), and suggestions for keeping costs low.