Usable Security
Let's start with
a new password experiment.
Authority
Grant/request the least amount of authority necessary to accomplish the task, and make sure users know what authority they have granted.
Authentication
Biometrics
Consider the usability of each
Test: With a partner or small group, have someone time you logging in to your phone using as many of the following as are set up for you:
Enter your results in this form.
View the results here