Design thinking is a structured yet flexible methodology that places the end user at the center of every decision, guiding teams through five iterative phases: empathize, define, ideate, prototype, and test. In qualitative research, design thinking provides the philosophical backbone for discovery work, ensuring that product, brand, and innovation decisions are built on genuine human insight rather than assumption. Research teams apply design thinking principles when scoping studies, framing discussion guides, and interpreting findings, because the methodology demands that conclusions remain anchored to observed and expressed customer behavior. When applied rigorously, design thinking reduces the risk of building solutions that miss the mark by keeping real customer voices at the center of the process throughout.