Although I use tab interactions more often than a scrolling panel interactions, there are plenty of situations imaginable for which scrolling panels have my preference.
A recognizable situation for an effective use of scrolling panels is when you are using feedback on questions in an e-learning course. In general, a question can’t be answered with a simple true or false. Most of the time you want to explain the learner why the answer was correct or incorrect. In that case a scrolling panel would be very handy, because you give the learner the choice to read more or less of the feedback.
In my submission for this challenge I ask the learner an open question and show them two of the five items on a feedback layer. These two items are good enough, but if the learner wants to know more he or she can use the scrolling panel to know more.