Requirements metrics

This week the hotest question among Agile Group Ukraine) was discussion about approaches how to measure requirement completeness and feature readyness for shipping. There were basicly 2 basic opinions: Are there any defined approaches to detect if you have ready feature or not.
Strange why people things that business value can be measured before you have money flow?
My conlcusion is that there are tracking methodologies to measure development tasks and there are tracking for business tasks also. But there is no methodologies how to correspond business and development tasks ...