Projects to implement ERP tend to be difficult, expensive and drawn-out. They are often full of painful surprises and overrun budgets and schedules that were extravagant in the first place. They fail entirely in an alarming number of cases.  Why this should be so is not immediately apparent. If we list, at a fairly high level, the tasks required to implement an ERP system in a company that’s already familiar with ERP practices, what we see is a significant but not daunting amount of work.

Read more in this paper by Adaptive Growth.