Keep Track of SharePoint Permissions without a Third Party ToolPosted: August 20, 2013
It’s not very high tech, but it works. Create a spreadsheet with tabs for your SharePoint Groups/Sites Matrix and each permission level used on the site. You may need to expand the SharePoint Groups/Sites Matrix to include lists and libraries that are uniquely secured.
Here is an example of one I’ve used.
View and download a copy of the spreadsheet here.