Short and sweet?
Is it better to have a long and detailed explanation at the top of your sign up forms?
Or would it be better to assume people know why they're there and keep the forms as short and simple as possible?
If you're not sure, you could just guess and hope.
Or you could test, measure, and find out.
What to do?
Hint: Guessing and hoping is not a plan. If you don't have enough information to make a decision, it's kind of hard to control the outcomes.
All the best,
A.