During the recent World Economic Forum in Davos, Yahoo CEO Marissa Mayer gave some unexpected mobile development advice during a panel discussion. She calls it the "two-tap rule." Mayer biographer Nicholas Carlson explains, "The test for the rule is simple, says Mayer: 'Once you're in the app, is it two taps to do anything you want to do?' If yes — the app is a go. If no, it's back to the drawing board."
The rule forces Yahoo developers to design highly focused apps that allow users to accomplish their goals quickly. Shane Schick from FierceDeveloper writes, "As the app industry gets more sophisticated about user experience design, I'd love someone--a market research firm, perhaps, or one of the big app store analytics companies--to produce a report that puts the two-tap rule to the test. For example, of the apps and mobile games that tend to top the app store charts, how many would receive a passing grade from Marissa Mayer?