"The second problem is that the Unified Modeling Language concentrates on implementation modeling rather than conceptual modeling"

“Modeling Principle: Models are not right or wrong; they are more or less useful.”

“Martin Fowler home page”

“Any fool can write code that a computer can understand. Good programmers write code that humans can understand.”

“Comprehensiveness is the enemy of comprehensibility”

“It is commonly said that a pattern, however it is written, has four essential parts: a statement of the context where the pattern is useful, the problem that the pattern addresses, the forces that play in forming a solution, and the solution that resolves those forces. … it supports the definition of a pattern as "a solution to a problem in a context", a definition that fixes the bounds of the pattern to a single problem-solution pair”

“People also underestimate the time they spend debugging. They underestimate how much time they can spend chasing a long bug. With testing, I know straight away when I added a bug. That lets me fix the bug immediately before it can crawl off and hide. There are few things more frustrating or time-wasting than debugging. Wouldn't it be a hell of a lot quicker if we just didn't create the bugs in the first place?”