Assessment centers offer a way to solve the problems of validity and reliability in personnel selection. An assessment center conducts tests of administrative skills in which trained assessors observe and record candidates' job-related behaviors and reach a consensus assessment of each candidate's performance. To apply the assessment center model to Canadian education, researchers established a pilot project for principal selection within the Peel Board of Education, a large suburban school district near Toronto. Development of the center consisted of a seven-stage process: (1) job analysis, in which 32 measures of skills, knowledge, and personality were identified; (2) test development; (3) validation of test content; (4) setting of criteria for grading test performance; (5) training of assessors, to achieve scoring reliability and testing skill; (6) pilot testing, evaluation, and revision of the entire assessment procedure; and (7) implementation of the assessment center, including use of the assessment results. At present, the pilot project has passed through all but the implementation stage. Appended to this report are lists of the measures, skills, and assessment techniques used in the pilot project as well as a comparison of the project's measures with those yielded by a national survey of Canadian principals. (Author/RW)