The study “School Heads Core Behavioral Competencies on Teacher Performance towards the Development of a Leadership Training Program” employs a mixed method research design, particularly the Explanatory Sequential Design. This study was conducted in eighteen (18) elementary schools and two (2) secondary schools in the Municipality of Lutayan, Province of Sultan Kudarat. This design consists of a two-phase process. In the first phase, quantitative data will be gathered and analyzed using a survey questionnaire. In the second phase, qualitative data will be collected via key informant interviews and focus group discussions (FGD). The data will be presented in tabulated form, analyzed, and reported verbally to address the research questions. For numerical data analysis, descriptive statistics and Pearson R correlation will be utilized. Conversely, thematic analysis will be employed to examine the qualitative datas patterns and themes (Braun & Clarke, 2019). Thematic analysis is a widely used qualitative research method for evaluating textual data that identifies, analyzes, and reports on patterns or themes in qualitative data (Braun & Clarke, 2019). Thematic analysis is a popular qualitative research approach for examining textual data in which patterns or themes are identified, analyzed, and reported on.