In 2003, the Object Management Group (OMG) officially introduced the Model-Driven Architecture (MDA). The specification explains how different OMG standards could be used together. MDA focuses on the concepts of Platform Independent Models and Platform Specific Models, two viewpoints on software systems, and how mappings between these two can be made in order to streamline software development. Through this approach, the functional specification of the system and the implementation specification are separated, allowing for better reuse and portability. An important technique used in MDE is model transformation. A model transformation is a process of automatic generation of a target model from a source model, according to a transformation definition, which is expressed in a model transformation language.This paper focuses on model engineering terminology and theory of model generation. The paper describes overall MDA scenario and emphasizes on model transformation. As model transformation is an important area in model driven development, we have compared various techniques available for model transformation. The paper also focuses on model theory and model composition techniques used for model weaving. General Terms UML, Metamodel, Model Driven Engineering
Enterprise Architecture defines the overall form and function of systems across an enterprise involving the stakeholders and providing a framework, standards and guidelines for project-specific architectures. Project-specific Architecture defines the form and function of the systems in a project or program, within the context of the enterprise as a whole with broad scope and business alignments. Application-specific Architecture defines the form and function of the applications that will be developed to realize functionality of the system with narrow scope and technical alignments. Because of the magnitude and complexity of any enterprise integration project, a major engineering and operations planning effort must be accomplished prior to any actual integration work. As the needs and the requirements vary depending on their volume, the entire enterprise problem can be broken into chunks of manageable pieces. These pieces can be implemented and tested individually with high integration effort. Therefore it becomes essential to analyze the economic and technical feasibility of realizable enterprise solution. It is difficult to migrate from one technological and business aspect to other as the enterprise evolves.The existing process models in system engineering emphasize on life-cycle management and low-level activity coordination with milestone verification. Many organizations are developing enterprise architecture to provide a clear vision of how systems will support and enable their business. The paper proposes an approach for selection of suitable enterprise architecture depending on the measurement framework. The framework consists of unique combination of higher order goals, non-functional requirement support and inputs-outcomes pair evaluation. The earlier efforts in this regard were concerned about only custom scales indicating the availability of a parameter in a range.
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