Why use the model driven architecture to design and build distributed applications?

OMG´s model driven architecture® (MDA®) unifies and simplifies modeling, design, implementation, and integration of applications - including large and complex ones - by defining software fundamentally at the model level, expressed in OMG´s standard Unified Modeling Language® (UML®). An MDA-based development goes through three steps - two producing models, one producing code - and typically iterates through these several times.