Based on a questionnaire focusing on the existence of various types of relation and sent to the Örnsköldsvik Industrial Group in 1987 and 1998, an effort to capture the dynamics is made. After a statistical analysis of the data obtained, it can be concluded that the structure of the industry has changed only marginally but that the companies that have been members of the industrial group for many years do have more relations with each other. These relations both relate to buyer-seller relationships as co-operation.