Word: One eyeball, one thumb

Definition: A way to illustrate mobile usage patterns. The idea being that most mobile users tend to operate their devices with one hand while only partially paying attention.

Reference: The phrase was created by Luke Wroblewski in his book Mobile First. In the book Wroblewski writes,

"Thinking 'one eyeball, one thumb' forces you to simplify mobile designs so they can be understood and used in these kinds of situations."

Thoughts: A study in 2013 demonstrated that 75% of smartphone users still operate mobile devices with one hand (be that holding it with one hand or cradling it). It is also understood that many smartphone users do not give the device their full attention all the time. How often do you use your phone while watching TV, commuting, or even eating dinner?

The "one eyeball, one thumb" notion is a great way to keep designers honest and always thinking about how their work will be consumed and utilized.

Question: How, if at all, will the rise of larger screens (phablets) change the game?