"This is an intermediate work that describes PERA, which is a general enterprise reference architecture model that is suited for manufacturing enterprises. The book explains PERA as a layered architecture, and within the context of an architectural life cycle. PERA at the conceptual level is focused on the integration of physical plant, human resources, and information systems. This approach is clearly suited to manufacturing, and in fact, the model has been adopted and adapted by Fluor Daniel Corporation (among others) and has been proven in practice..."