As my friends know, Business Value is a subject of keen interest to me. Perhaps I think there's a lot more juice there than we have squeezed so far.
I do not belong to any one school of business value. I think each of several approaches has much to offer.
Anyway, several recent conversations led me to write a blog piece. I titled it "Toward a General Theory of Business Value". Perhaps I had Einstein on the brain (not that there's anything wrong with that). While the title may sound abstract, I hope you find the piece of practical use. Here: Agile & Business
I would appreciate your comments on it.