Configuration Baselines
Configuration baselines allow versions of design data artifacts to be placed under configuration control, distinguishing between formal and informal baselines (snapshots).
Snapshots (informal baselines) are used to record the development status of various design data objects at any given point in time (e.g., before a major planned change) without affecting the ability to modify the design data objects.
In contrast, formal baselines have a direct impact on the ability to change a design data object. Objects that are assigned to an active formal baseline can only be changed by means of a change request.