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In a relationship both sides are important for the development. This is one reason why purchasing has always been as central as marketing in the empirical studies in IMP. The manner in which the features of business networks affect the role of purchasing and the roles of the suppliers and supply management is here in focus. The existence and importance of business relationships have normative consequences for purchasing that are very distinct and break clearly with some of the traditional normative recommendations for purchasing. The authors believe that ‘buying organisations increasingly need to develop interactive interfaces with their suppliers. One reason is that collaborative innovation and therefore the development role of PSM (purchasing and supply management) is becoming more important’. The conclusion is clear: If the buying organisations want to get more out of the suppliers than the supply of a standard product at a certain price, they have to engage in a more extensive interaction and develop a broader and closer business relationship that must be properly managed. That implies giving up some autonomy and accepting dependence on suppliers as developmental partners.

This study provides a comprehensive framework of adaptation in triadic business relationship settings in the service sector. The framework is based on the industrial network approach (see, e.g., Axelsson & Easton, 1992; Håkansson & Snehota, 1995a). The study describes how adaptations initiate, how they progress, and what the outcomes of these adaptations are. Furthermore, the framework takes into account how adaptations spread in triadic relationship settings. The empirical context is corporate travel management, which is a chain of activities where an industrial enterprise, and its preferred travel agency and service supplier partners combine their resources. The scientific philosophy, on which the knowledge creation is based, is realist ontology. Epistemologically, the study relies on constructionist processes and interpretation. Case studies with in-depth interviews are the main source of data.