In Microsoft Windows SharePoint Services, access to sites is controlled through a rolebased membership system based on site groups. Site groups specify what rights users have on a SharePoint site. These rights determine what specific actions users can perform on the site.
The following table lists all SharePoint Services user rights, their associated permissions, and groups that include these rights by default.
Groups included by default
Add and Customize Pages
Create pages for a Web site
Web Designer, Administrator
Add items to lists or add documents to document libraries
Contributor, Web Designer, Administrator
Add/Remove Private Web Parts
Add and remove Web Parts to personalize ...