20180125
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Software estimation and measurement:
+ Understanding the activities and risks involved in software development
+ Predicting the controlling the activities
+ Managing the risks
+ Delivering reliably
+ Managing proactively to avoid crises

Bottom line:
You must be able to satisfy your customer and know what you will spend doing it

To predict and control effectively, you must be to measure
To understand development process, you must be to measure
To understand the evaluate quality, you must be to measure

Effectively, "manage by the numbers" and better ensure the success of your software projects