Resistance is the primary reason why so many fail.
Most approaches to managing change ignore or trivialize the need to build commitment to changes such as mergers, reengineering, and new software systems such as ERPs. We live in an age of rapid and chaotic change. Failed changes cost organizations dearly. Research indicates that resistance is the main reason why so many new initiatives go way over budget or get implemented in ways that really weren't worth all the effort and cost. You must know your organization's capacity to handle major changes.