Abstract: An example embodiment provides a process relating to an inference engine for enterprise systems and enterprise contracts. In the example, the inference engine receives a fact and stores it in an input queue. Then the inference engine retrieves the fact from the input queue and routes the fact to a schedule queue on the basis of the fact's processing schedule and a condition that is part of a rule. The inference engine retrieves the fact from the schedule queue in accordance with the processing schedule and routes the fact to a rule executer on the basis of the fact's contents. The rule executer applies an action to the fact, where the action is also part of the rule and the action transforms the fact or creates new facts. Then the inference engine routes the transformed fact or new facts to the input queue and possibly to a persistent storage device.