Here's pretty much how the work flows: a writer produces his/her novel based on the agreed word count, approved outline, and deadline. The editor reads the manuscript and asks for revisions, if necessary. From there, the manuscript tends to go to CBS Consumer Products for approval followed by being given to a copy editor. The manuscript is also sent to production where the basic choices for the physical look of the novel are made such as font, headers, chapter title fonts, etc.
If the manuscript comes in shorter or longer than commissioned, adjustments have to be made to make the minimum page count to justify the cover price. In some cases (hi DRG III!), the manuscript is so voluminous, pages are added or the font reduced to make things fit. Some of these choices are mandated by the already solicited page count and cover price, some of these are practical matters given the cost in actually printing and shipping books.
Should CBS Consumer Products ask for changes, they are made now, before typesetting.
The copy edited manuscript is reviewed by editor and author then sent to production where it is typeset following the specs chosen.
Galleys are produced and are proofread by the author. Final changes are (hopefully) made and the book goes to the priinter where it is printed, bound, packed and shipped.
Then BBSers babble on as the book makes its way through the distribution system and arrives in sporadic fashion from coast to coast.
Read, repeat monthly.