Purposive sampling is a method used in research to carefully select participants that best match the goals of the study. By choosing specific individuals, researchers can improve the quality and reliability of their data. The article presents three case studies showing how purposive sampling can be tailored to different research contexts, enhancing the trustworthiness of the results. Each study used a unique approach to participant selection, aligning with the research goals and methodology. This demonstrates how purposive sampling can be a valuable tool for ensuring the rigor of qualitative research.