User Right Management ER Design

[Mjdagard]

Hello,

I would like to implement a simple user right management. I am not sure what the most efficient data structure is. Are there some resources on the net that explain the key features/structure?

I would like to have a system with USERs assigned to GROUPS. Now, a USER can select MODULES. The MODULES have different FEATURES with user rights according to the assigned group.

I am not sure how to design the realation USER <- GROUP -> FEATURES.

Thanks.