Nowadays business to business (B2B) coordination is characterized by long term contracts albeit the fact that most interactions are already made electronically based on ERP-systems. Especially in cooperations, the flexibility offered by electronic coordination is rarely used. With the term eContracting we refer to electronic coordination among participants in the sense of the alienation and acquisition, between individuals, of rights of property and liberty in supply chains which are influenced by new information technologies. An interdisciplinary approach, i.e. incorporating economics as well as computer science, will provide new means to the alienation and acquisition of short to medium term contracts in supply chains.