The need for change of direction in Software Engineering has been suggested in different resources. In recent years many organizations have focused on Model Driven Engineering (MDE) as an approach to application design and implementation and Model Driven Architecture (MDA) was introduced by Object Management Group (OMG) in support of MDE. Models are the basic elements in MDE and can be developed in a distributed environment. Thus once they merge together, conflicts and inconsistencies should be detected in a convenient way to be reconciled. In this book, we introduce the benefits of versioning systems in MDE framework. A conflict metamodel that is generated from the input metamodel and the architecture for detecting conflicts are represented. The proposed approach is metamodel independent and create conflict metalmodel for any input model which conforms to Kernel Meta Meta Model (KM3). The concept of used conflict model can be also changed regardless of models. The extended idea for conflicts detection, the presented architecture for model code management and the tools that detect conflicts of concurrent models can help to improve MDE in model code management.