augments model A's random sequencing with a pull mechanism, which includes the Feedback queue, the Update combination activity, and four links to tie them into the existing network. Cut Sheets initially are processed in random order relative to work areas, but as soon as an area is ready for spool installation, area-availability feedback is transmitted and used to update their status. Cut sheets that match this feedback are checked accordingly so that they will get priority over others to be fabricated, that is, they are "pulled" to the site. In the single iteration that is depicted, a total of 291 updates were performed.