This report describes the methodologies and results of the third follow-up Education Longitudinal Study of 2002 (ELS:2002/12) field test which was conducted in the summer of 2011. The field test report is divided into six chapters: (1) Introduction; (2) Field Test Survey Design and Preparation; (3) Data Collection Procedures and Results; (4) Field Test Questionnaire Timing and Data Quality; (5) Survey Control Systems and Data Processing; and (6) Summary of Recommendations for the Full-scale Study. The following are appended: (1) Technical Review Panel Summary; (2) ELS:2002 Data Collection Materials; (3) Third Follow-up Field Test Questionnaire; (4) ELS:2002 Cognitive Testing Reports, 2010 and 2011; (5) ELS:2002 Scale Reliability Analyses; and (6) ELS:2002 Third Follow-up Field Test Codebooks.