Having experienced and assessed, by monitoring a large number of sites, some recurring lacks during the execution phase of a project, the Author puts forward a wide disciplinary reorganization, also considering the recent Italian regulations about the design, the execution and the management of architectural or civil engineering contracts - both public and private - and, last but not least, those concerning health and safety on worksites. If construction site design is correctly set and applied, not only cut down the injury risk, but also improve significantly the qualitative and the economic performance of an intervention. The organization of the yard cannot therefore be seen as a discretionary prerogative of the involved firms, but it must fit into a far more complex and articulated framework, typical of any other design discipline. So, the goal is to give a possible solution to the approximation that afflicts the construction phase organization and management thanks to a performance approach applied to the construction site design. The volume is thus addressed to the decision makers of the ergo-technique design, accompanying them in a systematic way through the structure of the construction site design, structure that consists of steps that have to be consequential, subordinate or interrelated among them. In the first part of the work, the stages and the levels of the ergo-technique design are presented defining and illustrating the site systems areas and their properly design documents, as well as the roles and responsibilities of the decision makers. From a methodological point of view, the critical issues assessment is then introduced as a decision aid to the construction site design, thanks to the tool of the Criticality report. At the end of the first part, the so called Building Information Modeling (BIM) is described as a useful design method proposing some illustration of a series of significant examples. This method could be successfully applied to the construction site design both of a new construction and of a recovery process. Section II deals with the design of the technological-productive system, showing a number of typical logistic, plants and equipment and their performance parameters. In the third part of the book, thanks to the illustrations of many examples, the attention of the reader is directed to some typical civil/building works and site activities organization. Marco Lorenzo Trani Tenured Professor at Politecnico di Milano, School of Architectural Engineering, Ph.D. in Construction Management, M.Sc. in Civil Engineering. Headmaster of several Specialization Courses on Heath &Safety on construction site and Visiting professor. Safety Coordinator of significant architectural and civil engineering project for new construction and recovery. Public Body consultant for what concerns construction management.