Summary: Most mobile applications are used only intermittently, so they must be especially easy during initial use. In particular, upfront registration shouldn't be required before users experience an app's benefits. In preparation for our Mobile Apps Usability seminar, I've been sitting through numerous test sessions watching iPhone owners use hundreds of applications. Based on these sessions, we
![iPhone Apps Need Low Starting Hurdles](https://cdn-ak-scissors.b.st-hatena.com/image/square/676e9a51f4d15649b87ebb79757a22800fd31c61/height=288;version=1;width=512/https%3A%2F%2Fmedia.nngroup.com%2Fmedia%2Farticles%2Fopengraph_images%2FSlide13mobile-apps-initial-use.png)