The development unit itself maintains a list of criteria that need to be met before a task can be marked as completed. The criteria may include e.g. review requirements, documentation requirements and testing requirements.
New code will only be implemented after extensive testing that meets pre-defined criteria. Tests should cover usability, security, effects on other systems, and user-friendliness.
The definition of security-critical code for the various services is maintained. New parts of the critical code are constantly being identified and new updates are being checked particularly closely for changes to the critical code. The aim is to keep the likelihood of security vulnerabilities to a minimum.