Is the shopper score the reputation rank? That is all I see. And what does it even mean? What is the max self assign someone can get?

I have been with ISS quite awhile but still trying to figure it all out. I believe the reputation rank goes up with the more jobs you complete the more active you are on the forums, completing jobs, opinion polls, updating profile etc.

From what I have read when you complete jobs on time and by the terms of the company your reputation rank goes up as well.