Sorry about the breadth and complexity of this question. I realise that for most people this question irrelevant as most projects or PhDs are predetermined and that theories and methodologies for each discipline or topic are quite limited. However, for me that is not the case. My research topic is rather broad, and I was keen to explore the topic from different angles before deciding on a specific angle. When the angle was decided, it was not clear which theory to use and whether the project should be one of theory development or theory testing. I have since decided which theory to use but I would like to apply more intellectually rigour to my project.
Anyways, my broad question is directed to people and researchers who have experience or had to decide which theories to use for their project or PhD. What influenced your decision-making and what factors were relevant? I could not find any books or resources that helped me go through my consideration process, so I apologise for this question.
More specifically my topic is broadly about new migrants. I was keen to explore whether migrants who are new to Australia found or felt there are educational differences in the way they are taught in the workplace. Obviously, learning theories are relevant, acculturation theories less so, etc.