Researchers are encouraged to use triangulation by drawing from six sources of evidence: documentation, archival records, interviews, direct observations, participant-observation, and physical artifacts.
Typically "how" or "why" questions that explore contemporary phenomena within their real-life context. Case study research : design and methods
Establishing the standards for evaluating the results, such as identifying patterns or commonalities. Methodological Framework Researchers are encouraged to use triangulation by drawing
Yin distinguishes between single-case designs (used for unique or extreme cases) and multiple-case designs , which follow a "replication logic" to strengthen generalizability. Case study research : design and methods