I agree with that. That's step 4 in the article. It's probably not enough, in the sense that just looking at the mock screens doesn't tell you much about naviga

I agree with that. That's step 4 in the article. It's probably not enough, in the sense that just looking at the mock screens doesn't tell you much about navigation and widget selection. What came as a breakthrough for me was to actually mix screenshots and statically implemented screens in a real mobile app, then play a lot with that.