Koskela (1992) introduced an overview of this subject with his seminal work in 1992, nd still now, after six years committed to the development of a lean construction theory, he points out many conceptual questions. He states that a theory is relevant because it is a basis for communication and it enables explanation and prediction of phenomena. A theory of production, specifically, enables the structuring, controlling and improvement of production systems (Koskela 1998). In addition, Lillrank (1995) states that the consistent transfer of systems as complex as the Toyota Manufacturing Systems to Western construction industry requires a process of abstraction and application rather han simply copying. It means that besides theoretical abstractions we need to apply the Lean Construction approaches, principles and concepts to foster the consolidation of a heory.