Here’s the informal design process I’ve more or less evolved over the years. I’ve used it when I’ve had designers block and couldn’t get past a white canvas; I’ve used it to bring order to complex projects with hundreds of vague and conflicting requirements and I’ve used it for relatively simple component designs. Sometimes I complete it on paper in a few minutes, sometimes it takes a week. Treat the process like a fractal – use it to define the high level multi-page flows or use it to define page layouts and individual components.