multistep requirement forms

Hi all.. I've found a little tool to be usefull in one of my sites. Let me explain.. Under certain situations, I should be sure the user completes a step of a form or a quiz, or just I do need the user to select one Item or accept the terms and conditions before letting him continue, but I have a lot of documentation in the site about how to help filling these forms, or just with enough knowledge to help the user to comply the requeriments.. Even if the user must complete the operation, it should be able to see other content in the site, but do nothing else..