I see a lot of detractions here. One of the authors, Ivar Jacobson, is behind UML (together with Grady Booch & James Rumbaugh). Which explains where SEMAT fits - the enterprise. Specifically those that live in a world of class diagrams, sequence diagrams and activity diagrams. I doubt there's much benefit to the typical HN audience (for reasons the comments here point out), but SEMAT has a place.