This six-item, seven-point Likert-type scale measures the degree to which a person who has just had an extraordinary experience views it as being personally challenging and instructive.
This four-item, six-point Likert-type scale is supposed to measure the degree to which a person feels he/she has been challenged but prevailed in a situation.
Four, seven-point Likert-type statements are used to measure a person's attitude regarding the extent to which an Internet-usage task has challenged his/her abilities. The scale was called navigational challenge by Mathwick and Rigdon (2004).

