System and method for presentation of user interface for conducting contractual activity over a computer network

A system and method for presentation of user interface for conducting contractual activity over a computer network. The contract comprises a Business Rules Book containing a set of rules from which specific rules may be selected for inclusion in the contract, Terms and Conditions Set representing a unique set of instances of rules selected from the Business Rules Book is selected from a plurality of stored Terms and Conditions Sets, and a Product List Filter specific to each seller or buyer, targeting products in which there is a mutual interest. Contractual activities are executed through user interfaces developed by the parameters in the contract and are executed through the contract, which automatically inserts values from the terms and conditions of the contract.