This document provides an overview of quantitative and qualitative research methodologies. It focuses on defining qualitative research and describing some common qualitative methods like interviews, focus groups, observation, and document/text analysis. It also discusses how to analyze qualitative data through coding and identifying themes. The document notes some techniques to ensure credibility in qualitative research like triangulation, member-checking, thick description, and addressing bias. Finally, it gives some examples of how specific qualitative methods like ethnography and case studies could be applied to research questions in the GILD program.