Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Efficiency results.
| Usability tasks | Median time to completion (Interquartile range), seconds | CI, seconds |
| Task 1: Open the menu | 3 (9.2) | 2.5-10.4 |
| Task 2: Locate and open a paper | 8.9 (6.6) | 7.2-15.0 |
| Task 3: Locate a badge | 21 (7.5) | 16.5-23.9 |
| Task 4: Newsfeed one-word post | 37.5 (26.3) | 23.4-42.6 |
| Task 5: Add a user as a friend | 12 (24.8) | 9.1-31.1 |
| Task 6: Locate and view the leaderboard | 6 (2.1) | 4.3-6.63 |
