I try to manage roles and capabilities of my members. What I need, is to mirror Editor/Author/Subscriber of Wordpress for pages.
My website is done to present multiple bands of my association :
Each band will have editors for his own page (only).
Each subscriber/author/editor have at least one band.
Band pages can have subpages private or not (seen only by band members), e.g. private page of band A can't be seen/edited by Editors of band B.
Editors/Authors can write public articles.
I try many plugin like Groups, Advanced Access Manager, Nav Menu Roles, Press Permit Core, User Specific Content,... but I'm not able to do what I want. I'm sure some of those plugin can help but I don't know how to proceed simply.
I finally found some plugin for doing what I need: http://wordpress.org/plugins/bu-section-editing/
Multi-Site was not an option for me as this link suggest.
Thanks for your answer it helps me to discover multi-site and find what I need.