I correspond with a gentleman from a company called Software Advice from time to time.  His company recently did a survey on strategies used in implementing ERP solutions.
This is a good blog article that highlights the different strategies available, and how many companies choose those strategies, along with their success ratings.
It’s worth a look if you are thinking of implementing or changing your Enterprise Resource Planning, or any sort of technical/software-based change.
http://www.softwareadvice.com/articles/manufacturing/erp-implementation-strategies-1031101/