Triangulation is a method used in qualitative research to establish the validity of findings. Validity refers to whether the findings accurately reflect the real situation and are supported by evidence. This paper examines five types of triangulation: data triangulation, investigator triangulation, theory triangulation, methodological triangulation, and environmental triangulation. Data triangulation involves using multiple data sources and stakeholder groups to ensure findings are comprehensive. For example, evaluating an afterschool program would involve interviewing stakeholders such as youth, parents, teachers, and staff to gather diverse perspectives. Investigator triangulation uses multiple evaluators to assess the same program using the same method. If all evaluators reach the same conclusion, validity is established. Theory triangulation involves using professionals from different disciplines to interpret data. This method brings diverse perspectives to the analysis, enhancing the validity of findings. Methodological triangulation uses multiple methods, such as interviews, observations, and surveys, to study a program. If all methods yield similar conclusions, validity is established. Environmental triangulation involves testing findings under different environmental conditions to see if they remain consistent. This method is useful when environmental factors may influence results. Each type of triangulation has its own advantages and limitations. While some methods are more practical than others, they all aim to enhance the credibility of qualitative evaluations. By applying these methods, evaluators can ensure their findings are true and certain, thereby increasing the credibility of their evaluations.Triangulation is a method used in qualitative research to establish the validity of findings. Validity refers to whether the findings accurately reflect the real situation and are supported by evidence. This paper examines five types of triangulation: data triangulation, investigator triangulation, theory triangulation, methodological triangulation, and environmental triangulation. Data triangulation involves using multiple data sources and stakeholder groups to ensure findings are comprehensive. For example, evaluating an afterschool program would involve interviewing stakeholders such as youth, parents, teachers, and staff to gather diverse perspectives. Investigator triangulation uses multiple evaluators to assess the same program using the same method. If all evaluators reach the same conclusion, validity is established. Theory triangulation involves using professionals from different disciplines to interpret data. This method brings diverse perspectives to the analysis, enhancing the validity of findings. Methodological triangulation uses multiple methods, such as interviews, observations, and surveys, to study a program. If all methods yield similar conclusions, validity is established. Environmental triangulation involves testing findings under different environmental conditions to see if they remain consistent. This method is useful when environmental factors may influence results. Each type of triangulation has its own advantages and limitations. While some methods are more practical than others, they all aim to enhance the credibility of qualitative evaluations. By applying these methods, evaluators can ensure their findings are true and certain, thereby increasing the credibility of their evaluations.