Purposive Sampling
Purposive sampling is a non-probability sampling technique used in qualitative research where researchers intentionally select participants or cases based on specific characteristics, knowledge, or experiences relevant to the research question. It involves choosing individuals or groups that can provide rich, in-depth information to achieve the study's objectives, rather than aiming for statistical representativeness. This method is commonly applied in fields like sociology, psychology, and market research to explore complex phenomena.
Developers should learn purposive sampling when conducting user research, usability testing, or gathering qualitative feedback for product development, as it allows targeted selection of users with specific traits (e.g., expertise, usage patterns) to gain deep insights. It is particularly useful in early-stage projects, niche applications, or when resources are limited, enabling efficient data collection from key informants who can illuminate critical issues or opportunities.