How do you create a personality profile quiz like the one on eharmony or match.com, etc?

Annon: How do you create a personality profile quiz like the one on eharmony or match.com, etc?
How do they know that you are compatible? How do you write a quiz like that? I’d like to write one that is not nearly as complicated but don’t know where to start. Any books, consultants, ideas? Thanks!

Answers and Views:

Answer by Brown Bear
Well, you could start reading about studies on personalities. You could start with Keirsey for instance, because his work is very accessible. His book and his website talk about how people differ and also what types of people go well with others.

Studies like this could inspire you how to match people.