Abstract: A computer implemented system and process are provided for negotiation and tracking of sale of goods. In this system and process, a negotiation engine (16) operates to store data representing a current state (18) of a negotiation between a seller and buyer. The negotiation engine (16) stores the data within a framework for representing aspects of the negotiation between the seller and buyer. The framework includes a request object, a promise object and an acceptance object that can store a current description of a contract. The framework also includes a set of one or more delivery deals determined by the contract. Each delivery deal can have a delivery request object, a delivery promise object, and a delivery acceptance object that can store associated item deals and time periods for delivery of item deals. Each item deal can have an item request object, an item promise object and an item acceptance object that can store individual sales-order line-items.