[Sigia-l] Forcing practice

[Peter VanDijck]

The situation: an online application that has to be used by many users.
The probability of them entering wrong information is high because of
the complexity of the app, and the app cannot catch all data entry
errors. We can't change the app.

Part of the solution: when a user visits for the first time, a popup
forces them through a learning process. The goal of this is to minimize
the errors once they get to the app. 

My question: what form should that learning process take, and how can we
ensure they actually learnt something and didn't just click through the
popup?
All ideas welcome - go crazy!
Peter