Reliability is a crucial quality of a research instrument because it determines the consistency, stability, and dependability of the measurements obtained through it. In research methods related to community development and extension management, data are often collected from diverse populations under varying field conditions. If a research instrument such as a questionnaire, interview schedule, or observation checklist does not produce consistent results, the findings become questionable and may mislead planning, policy formulation, and program implementation. Reliability ensures that the variations in results are due to actual differences among respondents or situations, rather than errors in measurement. A reliable instrument enhances the credibility of research outcomes and allows researchers to replicate studies with confidence. In community-based research, where interventions are designed based on identified needs, unreliable instruments can result in incorrect assessment of community problems, ineffective interventions, and wastage of resources. Reliability is also closely linked to validity; although a reliable instrument may not always be valid, an instrument cannot be valid unless it is reliable. Therefore, ensuring reliability is a foundational requirement in systematic research. One important type of reliability is test–retest reliability. It refers to the stability of an instrument over time. When the same instrument is administered to the