- Subject-based: Environment, technology, etc.
- Success based: Reward, audience reached, etc.
- Age based: 30 years and under, youth, etc.
- Region based: Country, city, state, etc.
- Gender based: woman, man, etc.
- Membership based: Ashoka, etc.
Emadoddin Ghazi
Thanks for your question. I prefer Subject-based.
You can also use grounded theory (G.T.) research method. Because it has a more comprehensive look.
Best regards.
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