Embodiments consistent with the invention transform business application logic entities or structures into OOP structures that represent the data, relationships, and operations of the business application structures. The business application structures are transformed from the application level, including consideration of the business application logic and relationships. In one embodiment, transformation is done using a set of automated transformation rules. The resulting OOP structure model of the business application structure may be used with OOP tools to analyze, maintain, debug, modify, and revise the business application structure, and to create new structures for the business application.