$$Ontology$$ and $$epistemology$$ are two key philosophical research concepts.

a$)$ In detail, explain the $$Realist stance$$ and the $$Idealist stance$$ vis$--$vis the ontological research concept with references.

b$)$ In detail, explain the $$Positivist stance$$ and the $$Interpretivist stance$$ vis$--$vis the epistemological research concept.