Some of my colleagues who are end users are familiar with SharePoint as they have been using it since 2007 version. They have the understanding that default Members group in a site collection will have Contribute permission. They are right! However, when they added users to Members group in SharePoint 2013, they had surprise as well as scared for the fact that Members were able to delete List/Document Library. Members Group Yes, in SharePoint 2013, by default Members group is mapped to "Edit" permission. Edit permission is a superset of Contribute permission. With "Edit", users will have permission to create/modify/delete List. Basically, Edit = Contribute + "Manage Lists" permission Just take a note of this before you add users to Members group . You can either change the permission of Members group or create a new group mapping to Contribute permission.