This thesis is concerned with methods of investigating the culture of the construction industry. Initially, two kinds of method are identified: formal and informal. The relationships between methods, purposes, definitions and findings are explored. It is shown how formal methods are underpinned by informal ones. Criteria for the adequacy of informal methods are identified. In the light of these criteria, an ethnography of an aspect of industry culture is presented. Dubbed the 'claims culture', this aspect is explored to show how planning for claims is an integral part of project management in the industry. Practical, moral and emotional aspects of the claims culture are investigated. Two sets of recommendations are derived, one set for managers, the other for researchers. The recommendations for managers include advice on avoiding and managing claims, as well as comments on the feasibility of transforming the claims culture. The recommendations for researchers summarize the central argument of the thesis, offering an account of the adequacy of various types of research reports.