Sampling activities for Year 11 of the National Assessment of Educational Progress began in 1977 when plans were begun to Years 11-14. In March 1979 the sample was selected and allocated. In-school secondary sample selection activities were carried out during May through August, 1979, and in-school package assignment and field support activities were begun in August and continued into 1980. Sample weight computation activities began in January and continued through August 1980. The Supplementary Frame secondary sample was selected in July and August 1979, and the third-stage sample of discontinuers and early graduates was selected during March through May 1980 and administered in June through August. Supplementary Frame weights were computed in September through November 1980. This report documents the Year 11 in-school sampling and weighting activities, and the Supplementary Frame activities. Primary type of information provided by the report: Procedures (Sampling) (Weighting). (Author/BW)