Self-report of engagement
Immediately following the use of each application, participants were asked how much they liked the application by presenting them with a line bounded by two choices.
I did not like it———————————I liked it a lot
To indicate their attitude towards the application, participants were instructed to place a mark on the line between the two choices. The distance from the left-most position on the line to the mark was used as an index of participants’ self-report of engagement.