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.
The x-axis represents mean overall mental effort. The y-axis represents performance. The gray dotted line reflects the midline for efficiency, such that efficiency scores to the left of this line indicate high instructional efficiency and scores to the right of this line indicate low instructional efficiency.
