Eric Evans' book Domain Driven Design is all about this approach and is one of the best and deepest books about software design. (Disclosure: I worked with Eric

Eric Evans' book Domain Driven Design is all about this approach and is one of the best and deepest books about software design. (Disclosure: I worked with Eric for a few years. But that was because of my high opinion of his book and not the other way around.) Finding an appropriate language/notation for a problem is perhaps the most important step in solving it. But it's also perhaps the hardest. Most software projects don't try. That's one reason most software is a mess.