Georgia's competency testing program has gained national recognition and has served as a model for other states planning such programs. The focus of this paper is on the Teacher Certification Test (TCT) in Administration and Supervision developed to conform to stringent legal and job-relatedness requirements. The test is required of educators seeking initial certification in this area who finished their coursework after September 1980. This study details the steps followed from goal selection through field tryout and item selection for the test. Analyses of the performance of 841 persons who took the test between September 1978 through June 1983 revealed that the pass rate on the initial testing was about 68 percent, while subsequent retakes raised the final pass rate to about 81 percent (females 84 percent, males 77 percent, blacks 46 percent, and whites 88 percent). Analyses of data from 205 persons who took the test revealed that students who completed a planned degree program and coursework in the areas of administration and supervision passed the test somewhat more readily. (MLF)