Energized Accounting has a links to a couple of great articles on Software Implementation and the info is very applicable to Dynamics GP. Here’s a taste:
Documenting and automating every minute step of every process in a
business cannot be put on a fixed, linear implementation schedule.
Unforeseen problems will arise, requiring changes to those business
processes and/or the software itself. Sometimes these changes can
impact the timeline by weeks or months.
Make you take a look at this. We all need to be reminded of the basics once in a while.