Today's building and construction projects are often characterized by the use of diverse technologies and the involvement of heterogeneous organizations where many disciplines contribute with their specific knowledge and competencies, to realize complex projects. These are just some of the elements that apply, and challenges projects parties more than ever. Increasing demands and regulations of public authorities were factors such as environment, sustainability, social responsibility and the involvement of communication and information technologies are merely some of the tightened demands that projects parties are subject to. The development causes complex management challenges regarding technology, communication and coordination between divergent disciplines to bring their knowledge and competencies in action. In this report we examine the management technologies used in complex construction projects, and how these mediate. At the same time we focus on the production of discipline specific facts and the role they are ascribed in the management technologies. 
The survey is designed as a case study in which qualitative interviews and ethnographic studies are performed. The pro tempore largest construction project in Denmark, the establishment of a fixed link between Denmark and Germany across Fehmarn Belt, and the consequential geological and geotechnical feasibility study, provides the framework for our survey. Actor-Network Theory is used as the theoretical framework, and through the selected themes in the analysis that breaks with time and space, we seek to answer the thesis of this report. 
The work of the geological and geotechnical feasibility study has been carried out based on a strategy that provides a common basis for decisions. The strategy mediates and is applied as a management technology, particularly as a rhetorical discursively grip to introduce differences and exclusions, create interest for the construction project and retain the parties involved. The client Fehmarn A/S has contracted with a number of organizations to assist them in identifying and uncovering the soil in Fehmarn Belt to minimize risks. Discipline specific facts are produced in alliances from negotiated procedures aimed to bring consistency in the results obtained. All results are presented in a comprehensive relational database, which mediates, creates transparency between the involved parties and which also is used as a management technology. The relational database provides the leading roles the opportunity to create strong alliances and powerful relationships.