The acquisition of business services is becoming increasingly important for many organizations. However, buying business services has not been studied in much detail and the studies that have been conducted have either focused on one type of service or a specific stage of the purchasing process (i.e. supplier selection). This paper presents the partial results of a series of interview studies into the purchase of business services and the ongoing interactions following a purchase. The paper addresses the interface between service buyers and service providers, more specifically the Decision Making Unit (buying centre). The paper investigates whether the Decision Making Unit varies for different types of services across different types of com...