Abstract: A business information management system for facilitating transactions between a business entity and a second entity, comprising a database (8) containing organisation data for the business entity, the organization data defining a hierarchical arrangement (12) of users (24,26,28,30,32,34) within the business entity; Interface means (6) to a communications system for exchanging data with the second entity (4); an engine (10) in communication with the interface (6) and arranged to exchange data with the second entity (4) regarding a transaction between the business entity and the second entity (4), and to store said data in the database (8), the engine (10) having a plurality of operations that can be performed on the data; The database (8) further containing configuration data defining business rules to control said operations, each user's access to data in the database and which of said operations each user may perform on said data.