How to Measure Anything: Finding the Value of Intangibles in Business

There's no "model" there, just a methodology. Hubbard does consulting and sells books, that's how he monetizes this as far as I know. His book How to Measure Anything[1] lays out the core ideas in sufficient detail for somebody to implement the basic idea. A used copy could be acquired for < $10 if one were interested in learning more.

[1]: https://www.amazon.com/How-Measure-Anything-Intangibles-Busi...