The aim of this study is to develop a scale to determine how often secondary school teachers adhere to general teaching principles. For this purpose, 211 teachers who work in secondary education institutions in Yunus Emre District of Manisa Province were included in the research group with the stratified sampling method. The 54-item experimental form of the scale was subjected to expert opinion, and as a result of the analysis, a 50 -item candidate scale was created. In order to determine the construct validity of the General Teaching Principles Scale, Exploratory Factor Analysis (EFA) was performed using the geominQ rotation method. Cronbach's Alpha coefficient was calculated for the reliability index and Confirmatory Factor Analysis (CFA) was performed to test the accuracy of the structure revealed by EFA. SPSS 26.0 software was used for reliability analysis, Jasp 0.13.1 for Exploratory Factor Analysis and R Studio 1.2.5033 software for Confirmatory Factor Analysis. The results of the validity and reliability studies conducted on teachers working in secondary education show that this developed scale gives valid and reliable results.