Qualitative Methods and Interview Checklist -What is Participant Observation? Why is it useful? advantages and disadvantages?

-What is Interview checklist? Why is it useful? advantages and disadvantages?
-What is Coding?(Interview coding)Why is it useful? advantages and disadvantages?
-What is Visual methodologies? Why is it useful? advantages and disadvantages? Buckley and Chiang define research methodology as “a strategy or architectural design by which the researcher maps out an approach to problem-finding or problem-solving. “According to Crotty, research methodology is a comprehensive strategy ‘that silhouettes our choice and use of specific methods relating them to the anticipated outcomes, but the choice of research methodology is based upon the type and features of the research problem.