Touch guidelines like Apple's 44 pixel target are based too much on technology, and pixel sizes. They are not based on the real world, on people's hands, fingers and thumbs. Now we have real research, including thousands of new, original observations on how people hold and touch their phones, phablets and tablets.

We can increasingly understand why people act this way, and can use this information to design for the different ways people actually use their mobile devices: Fingers and thumbs take up space, and cover the screen. People have worse accuracy at the corners of screens than the center. People are worse at using their touch screens just when carrying a bag of groceries in their other hand.

Steven will present not just the background and principles of designing good mobile touch screen experiences, but give ten specific guidelines you can use to make sure anything you design or make for phones or tablets is readable, understandable, usable, and tappable.