| Summary: | Studies show that the success of a construction project depends onits initial design work. Thus, it’s interesting to investigate howensuring design work quality is done. Since the mid 70’s SKB has worked on how the final repository of spent long-lived nuclearfuel should be built to satisfy the requirement of total repository from the people and environment for a period of 100,000 years. The project is large and consists of many subprojects; where one of them is carried out by WSP. The quality work in this project has been evaluated to see how the ensuring of reaching required quality and expectations. This type of project can be assumed to be complex both to control and execute, in terms of structural complexity, technical complexity and uncertain complexity. By characterizing the project due to its surroundings, content and organizational behaviour and to them apply the dimensions of complexity the aim of the study is to identify how the complexity has effect the quality work. To understand this, semi structured interviews with the project organization has been done. The result of the study shows that especially the structural complexity, mainly by the number of collaborated departments, affects the quality work. Also uncertain complexity affects the quality work, due to unclear contract between client and supplier. To receive better quality work in the future the coordination between different departments needs to be better. This involves for example establish project specific methods and routines, for all in the project to use. To be able to deliver successful projects one presumption is that client and supplier agreed on what is to be delivered. If the project scope isn’t clear agreedupon, a satisfied client can never be reached.
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