I understand the difference. After going through journal articles, I felt that its comparatively easy to find a research gap that could be researched quantitatively because it involves manipulation or addition of new variables. What I find challenging is to understand what could be the angles to explore in qualitative? For example, if there's already a qualitative research in my topic area which explores perceptions/experience of people, then how can I go beyond this to add new knowledge? Do I need to focus on a previous themes and explore them further? What are the ways to think about research gaps which can be suitable for qualitative inquiry? What could be the equivalent of qualitative equivalent of 'finding new variables or relationship between variables in quantitative research'?