The central concept behind model-based definition (MBD) is that the digital model contains all of the detailed information necessary for all aspects of the product life cycle. This includes everything from design to manufacturing, in particular, GD&T data.
When the digital model is the authority it removes ambiguity, conflict and doubt that arises when drawings and models co-exist. When the 3-D model is the authority, MBD eliminates errors that result from referencing incorrect sources and makes processes more efficient.