Goal
- let users choose whether or not they want to use a third-party service.
- Provide an alternate means of access to the service.
- Provide a means of access under the control of the service’s administrators.
- Limit your dependence on a third party, whose policies and technical and sales strategy will undoubtedly change over time.
Implementation
Set up an account creation procedure by entering or creating a username and password specific to the service.
Control
Check that it is possible to create an account without using a third-party service, by entering or choosing a specific username and password.