The Industrial Marketing and Purchasing Group or International Marketing and Purchasing Group is a European research initiative in the field of Industrial marketing established in 1976 by researchers from different countries and universities in Europe. It has evolved into an "informal international group of scholars concerned with developing concepts and knowledge in the field of business-to-business marketing and purchasing." The group is also called the Nordic school of marketing.
The first IMP Group research project was developed on the basis of empirical observations which did not fit into the mainstream economic theories’ assumption about an atomistic market: Industrial marketing and purchasing appeared to take place within stable, long-term business relationships. But why do companies develop these interdependencies? What benefits could outweigh the drawbacks of being dependent on others? These and other related research questions have triggered a large number of empirical studies over the past three decades of the “doing of business”, carried out by increasing numbers of researchers. These scholars have investigated a wide variety of interactions between individual companies and organisations as well as the wider network that surrounds them. These empirical studies, including issues such as marketing, purchasing, technological development, management, logistics, business communities and policy all challenge mainstream business theory and call for theoretical tools that allow investigations of the interactive aspects of the business landscape.
The initial research of the IMP Group, as Young 1989 acknowledged added "significantly to the knowledge of how companies in industrial markets develop their international activities and what has contributed to the success of companies." Möller and Wilson mentioned that this "work of the IMP Group can be accessed through Hakansson and Ford." In 2012 Rider et al. confirmed, that "the work of the IMP Group is reported in some dozen books, about 2,000 papers and more than 130 Ph.D. studies," based on data from the IMP Group website in 2009.