In my role at work, I do a lot of design work. Not graphical design - or our product would look awful! - but technical design. The documents that describe how to get from where we are now - with feature ABC missing, to where we want to be - with feature ABC present.

I'd like to think I'm quite good at this. But I know for a fact that I could be a lot better. We all could.

So, I ask you, when you produce, or read, these kinds of designs, what makes it good and what makes it bad? How can I do better at this?

(My own thoughts will follow in the comments later on, to avoid leading any discussions...)