There are 2 key kinds of parameters to take into account: demographics and psychometrics.
Demographics of the target group(s) are typical about numbers and facts, and include such facets as:
cultural history etc.
Psychometrics is a little trickier. This really is about specific characteristics of this typical future users of the application. You will need to develop a step-by-step portrait of these individuals. The questions that are basic your questionnaire will include, but they are not restricted to:
Which are the users like, as individuals?
just exactly What character characteristics do they will have in common?
What’s their day/week that is typical like?
What exactly are their core values?