Understand what you have

 Save hundreds or thousands by ensuring your company is not adversely affected by failed upgrades

 Ensure changes to your company systems are successful

Ensure your development work is repeatable

Gain a better understanding of Change and Configuration

Spread knowledge to your team

Look good to your superiors by proving skilled staff that make you look good

Save your time by doing the work for you, leaving you to do the tasks you are best at

Configuration Management is about understanding what you have, where it is and how it interrelates with the other "bits" you have.

Change Management is an organized, systematic application of the knowledge, tools, and resources of change that provides organizations with a key process to achieve their business strategy.
Lamarsh