Three fiscal year 1987 deliverables due for the "Toward a National Educational Testing Network: Feasibility Study of Duplex Design" are presented. The study is concerned with implementation of statewide and interstate testing of student attainment. The report includes: (1) a duplex design (DD) review paper discussing the means by which the DD will meet local and state information needs; (2) sample students' score reports from the Illinois pilot implementation of the design; and (3) item parameter estimates (IPEs) and standard errors for sub-skills of the eight second-stage forms of the duplex instrument used in Illinois. The DD review covers educational information needs, uses of attainment information, the combination of student achievement testing and assessment of curricular objectives, the contribution of modern Item Response Theory (IRT), adaptive testing, reporting results, and interstate comparisons. The California Assessment Program is described. The DD proposed supplies achievement scores for individual students in the main areas of proficiency and content, while evaluating the progress of schools in attaining the objectives of the instructional program and curriculum. The DD uses IRT, matrix sampling, and two-stage testing techniques. The IPEs are tabulated on 24 pages. (TJH)