In this diagram, the Product Package Order function can be seen as part of the product package lifecycle. This lifecycle is controlled by the product package subsystem, and goes through a sequence of four states: Designing, Developing, Ordering and Supporting. The lifecycle flow is left-to-right, as indicated by bold black arrows. In contrast, feedback loops flow right-to-left (example shown in red).

In the lifecycle flow, information created in one function drives the way work is performed in each "downstream" function to its right. For example, the information produced by Product Package Development determines the nature of the Product Package to be ordered.

Feedback from one instance of the product package object may change the nature of later instances. For example, a bug found in Product Package Support for one instance may be fed back (red arrow) to Product Package Design to modify the design for later instances.
©1995-2012 Ackley Associates   Last revised: 12/10/10