It is now 15 years ago that I first stumbled over structured methods, and in particular GEI’s Promod tool. I can vividly remember that, though not understanding much of what it was all about, I was immediately struck by the feeling that this was important stuff—up to then, I had been programming Assembler only. I had not received proper programming training, let alone exposure to theoretical computer science. The idea of visually specifying systems with tool support has never left me.