Original Source:  bizfluent 

"All businesses face change at some point in their life cycle. This may be thrust upon them by outside factors such as competition, globalization, political changes or rapid technological progress. Or, the business may seek change proactively through a merger, improving business procedures or reforming the product offering. Whatever the reason, managing change is a multi-disciplinary process. There's no way to pull the various strands together without some clear tools and techniques in place to drive the change implementation forward