It is very important to consider the average implementation time for a new ERP package. As mentioned, get members on the team from each department with a stake in the implementation. Also, when visiting companies that have implemented the software, make sure they are about the same size as your organization and TALK to the USERS. Find out if the software is intuitive and user friendly. Don't be swayed by how easy the sales implementation team makes it look, as they use the software all of the time!