Model driven development is an important role in software engineering. It consists of multiple transformation functions. This development is a paradigm for writing and implementing computer program quickly, effectively, at minimum cost and reducing development efforts because it transforms design model to object-oriented code. Our approach is rule-based model driven development in which textual Umple model is used as primary artifact and transformed to mobile applications. In this model driven development, evaluation of quality of transformation is critical. This paper has presented a set of metrics to assess the quality attribute of modifiability and evaluated using these object-oriented metrics. Results represent our approach achieves high efficiency in quality of modifiability.