This final report summarizes Year 11 quality check activities for the National Assessment of Educational Progress (NAEP). A probability sample of 40 schools was selected for quality check purposes from all three age classes. One regular school was selected for each District Supervisor at each Age Class. Quality check activities were conducted in these schools during the period of October 1979 through May 1980 by staff from the Research Triangle Institute (RTI). All checks were conducted with the consent and cooperation of the schools involved. The sample design and other sampling activities associated with the Year 11 quality check are documented in section 2 of this report. The procedures used to implement the quality check are dicussed in section 3. The results of the quality check are reported in section 4. Conclusions and recommendations for future quality checks are presented in section 5. Primary type of information provided by report: Procedures (Field Administration). (Author/BW)