First a question are you going to invest? Or join the bounty to a specific ICO?
If you are going to invest find
1. If it is sof cap.
2. If you think the ICO it self has platform that can help the future.
3. Trust the ICO if you are now willing to invest.
If you are going to join the bounty
1. Look at the ICO follow my instructions at the first 2
2. Look at the campaign manager see his trust results or his past campaign.
3. Look at the percentage that you are joining is much higher.