Promise

The action taken by “Performer” to commit to a “Customer” to take some action to produce a mutually understood result (“Conditions of Satisfaction”) by a definite time in the future. (See Reliable Promise, below). “Pull” – A method of advancing work when the next in line customer is ready to use it. A “Request” from the customer signals that the work is needed and is “pulled” from the performer. Pull releases work when the system is ready to use it. “Push” – “Push” – an “Order” from a central authority based on a schedule; advancing work based on central schedule. Releasing materials, information, or directives possibly according to a plan but irrespective of whether or not the downstream process is ready to process them.