In March 1992 the Arizona State Department of Education and educators across the state conducted a pilot study of 67 performance assessments developed for the Arizona Student Assessment Program (ASAP). This report describes various aspects of the reliability and validity of the 67 assessments (primarily constructed response) developed by The Riverside Publishing Company to measure essential skills in reading, mathematics, and writing in grades 3, 8, and 12. Eighteen assessments were administered to third graders, 23 to eighth-graders, and 26 to high school seniors. A total of 115,259 pilot assessments were scored, representing 1,023 schools in 208 districts. Assessments were scored by Arizona educators except for a small group professionally rated to establish calibration and anchor papers. Reliability values generally indicated that assessments could be reliably scored by a single rater. Validity was considered adequate for the majority of the assessments. Twenty-four tables present study findings, supplemented by 3 appendixes of correlations and validities, including 67 correlation tables and 13 scree plots. (Contains six references.) (SLD)