The current study reports the evidence for the reliability (via coefficient α, coefficient ω) and validity (via confirmatory factor analysis, correlations) of the Teacher Efficacy for Promoting Partnership measure. Participants were 255 in-service Head Start educators from all Head Start regions across the United States. Educators were sent a survey to complete with a cover letter, written consent form, survey, and compensation for their contribution. To maximize survey response rates, a follow-up post card and survey were sent. Results from the study indicated strong evidence for the reliability of the measure with both coefficient alpha and coefficient omega. Furthermore, evidence was found for convergent-related validity of the measure. The results of the confirmatory factor analyses suggest that further refinement and analysis of the measure is necessary. (author abstract)