Joomla! Documentation™

Overview of ACL in Versions  

Outline of the available and major ACL changes between versions and series (including and ). The table below summarizes the major changes from version 1.5.

	Version 1.5	2.5 series
Groups	7 fixed groups (Public, Registered, Author, Editor, Publisher, Manager, Administrator, and Super-Administrator)	Unlimited user-defined Groups
Users & Groups	A User can be assigned to only one group	A User can be assigned to multiple groups
Access Levels	3 fixed Access Levels (Public, Registered, Special)	Unlimited user-defined Access Levels
Access Levels & Groups	Relationship between Groups and Access Levels was fixed.	Groups are assigned to Access Levels. Any combination of Groups can be assigned to any Access Level.

We see that in every case the ACL has been made much more flexible since , with unlimited Groups and Access Levels, and the ability to assign one User to multiple Groups and any Groups to any Access Level.