Young adults represent a particularly difficult population to follow in longitudinal designs. In this study, a sample of young adults who applied to a program designed to build ethnic/religious identity (Taglit- Birthright Israel) between 2000 and 2003, when they were ages 18-26, were surveyed in February-June 2009 to evaluate program impact. The gap between program application and data collection covered significant transitions in the lives of these young adults, including graduation from college, pursuit of postgraduate education, employment, and marriage, all of which degraded the quality of the contact information collected at time of program registration. To avoid coverage error due to poor contact rates, an extensive set of data enhancement and tracing activities were undertaken. This proposal examines these efforts in detail and considers their effectiveness. The initial step was to standardize and update the registration data via a third-party vendor, using the USPS NCOA and Extended NCOA databases, as well as telephone appends. The first contact attempt was via email to all email addresses supplied at time of registration. Telephone contacts then began with to telephone numbers supplied at time of registration and the appended telephone numbers. Where a family member or other person with knowledge of the target individual was located, new contact information was sought. In other cases, additional steps to collect data were undertaken. Two "people search" services were used, Intelius and PublicRecordsPro, together with an email address database (emailfinder.com), regular white pages listings, social networking sites (Facebook and Linkedin), as well as general Internet searches for the individual. A final contact rate (CON2) of 62 percent was achieved, much higher than would have been the case without extensive follow-up.