1. Randomized Controlled Trials (RCTs):

   • Gold standard for evaluating interventions' effectiveness.
   • Experimental design with intervention and control groups.

2. Cohort Studies:

   • Observe groups over time, useful for studying long-term outcomes.
   • Observational study following a group over time.

3. Case Studies:

   • Useful for detailed analysis of unique or rare situations.
   • In-depth analysis of an individual, event, or situation.

4. Phenomenology:

   • Exploration of lived experiences regarding a phenomenon.

5. Ethnography:

   • Immersion into a culture for understanding behaviors and practices.

6. Grounded Theory:

   • Developing theories grounded in empirical data.

This flow provides a clear and concise overview of each type of study, outlining their purpose and methodologies for better understanding and differentiation.