The validation of a classroom observation instrument to be used in evaluating teacher interns under the Kentucky Teacher Intern Program is described. The validation project began in 1988. Fourteen educators from state universities comprised a jury that judged the initial version of the instrument and compared it with the instrument previously used, an observation instrument from the Florida Performance Measurement System. Participants applied the instrument to videotaped samples of classroom instruction. For determination of test-retest reliability, subjects from the validation phase oriented 28 local educators with regard to the use of the revised instrument. Each participant coded two videotapes and one actual intern in the classroom. This test established that the instrument had sufficient reliability and validity to be used in the Kentucky program. Data indicate the need for a small group of knowledgeable people to revise the coding manual and make some revisions to the coding instrument. Thirteen tables are included. Five appendices present the original and revised Kentucky Teacher Internship Program Classroom Observation Instruments and supplemental information about the development of the instruments. (SLD)