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You'd never think a guy could write so much about a blog application but to date after 6 parts we have covered a mass of detail from initial setup of our project's directory structure to Authentication of users. To date the feedback has been overwhelmingly positive to this series and I'm presently collecting comments regarding improvements for later inclusion. Today's entry concerns authorisation. We previously covered how to authenticate an author to the blog, but we still have nothing ensuring only authenticated authors can access the new Administration Module. This is the domain of Zend_Acl, an implementation of an Access Control List system which limits access to resources by the roles assigned to a user.