1. A product management platform employing metadata and rules to drive dynamic behavior for workflow, user experience, and system integration, the platform comprising: a processor in communication with memory; a functional unit in communication with the memory, the functional unit comprising: a core model in communication with the processor, the core model operating at a management level, the core model including one or more core entities to provide a common view of the entities in an enterprise; at least one model extension entity, the model extension entity adapted to communicate with the core model, and to support an extended functionality of the core model while a defined functionality of the core model remains constant; a model rule manager to establish one or more rules to define a relationship between the core model and the model extension entity, wherein each model rule defines conditions under which the model extension entity applies to the core model; a director in communication with the model rule manager, the director to filter the one or more model rules and to establish a relationship between the extension entity and the core model, wherein the director is selected from the group consisting of: a rule engine and an expression language processor; and a presentation manager in communication with the director, the presentation manager to create an integrated system through integration of the model extension entity with the core model, including provision of a customized view of the core model with the customized view including the defined relationship between the core model and the model extension entity.