We have seen a few implementations now that require a possibility to allow new users to sign up to ADAM. After approval, these users can use ADAM.
The self registration page should request user name and email address and some optional additional metadata fields that are grouped in a special field group, like "contact person", "address" etc.
New created users should be linked to a special user group to prevent using the system until they are approved. Then it is easy to setup a rule to trigger the approval process.
Customer support service by UserEcho