However, the first point to be observed is that the decisions are time dependent. They are made during several points of the PDP and are a result from the different level of participation of each field during the PDP. For instance, the Marketing Team has a great level of decisions made during the first step of the PDP, despite its contribution to the whole design cycle. Other point to be addressed is that many perspectives and decisions are inserted in methodologies and theories of Project Management, Engineering Design, and Concurrent Engineering. Those disciplines are usually treated in an isolated way. However, those disciplines are complementary.