This article discusses the original development and subsequent updates and revisions made to the Teacher Observation Form (TOF). The TOF is a 12-item form to be used by evaluators in the observation of teachers of gifted and talented students. After nearly 25 years of use, the original TOF was revised based on input from content experts and modified to reflect current effective standards of practices in gifted education. The revised TOF was then used on 217 occasions over a 2-year period to evaluate teachers in university-based enrichment programs. Results indicated that alpha reliability estimates increased for 9 of the 12 TOF items and that the overall rater-level effect (intraclass correlation coefficient) was comparable with that of classroom-level effects in standardized test scores. Based on these findings the authors offer the TOF as a means to provide feedback to teachers as to the prevalence of gifted education pedagogical effective practices in their classrooms. (Contains 4 tables.)