Eric Kimberling delivers a Post-Mortem Analysis of ERP Lawsuits and Failure Points.
While not specific to GP or even other Dynamics products, the lessons are universal.
Post-Mortem Analysis of ERP Lawsuits and Failure Points | 360° ERP Blog
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.