The book outlines a linear but iterative process for conducting research:
Determining how the collected evidence will support the research claims. Case study research : design and methods
Researchers are encouraged to use triangulation by drawing from six sources of evidence: documentation, archival records, interviews, direct observations, participant-observation, and physical artifacts. The book outlines a linear but iterative process
Yin identifies five critical components that must be determined at the outset to ensure research quality: Case study research : design and methods
Defining what the "case" is (e.g., an individual, program, or organization) and establishing its boundaries.
Establishing the standards for evaluating the results, such as identifying patterns or commonalities. Methodological Framework
Concepts derived from existing literature that guide the study's focus (optional for exploratory cases).