We protect your information in a number of ways.  Firstly the site role give minimal (User), senior management (Management) and Administrative (Client Admin) access to the site. 

Welcome emails are only sent when you are ready to do so.  If the user doesn't receive a Welcome email then they can not login in. 

Line managers of groups can automatically see and manage the employees in their group, even if they are minimal users.

Furthermore Functionality Roles can be given to minimal users to extend their access into the specific areas that they need to see.