The subject of the three filters - deletion, distortion, generalization - determining what is of value to the learner I find to be interesting.With regard to distortion, I have come across this with some students. It seemed they focused on the logistical things like "We were told we are to receive notebooks, pencils." And during the courswe of their studies, the focus became something like "Why do we have to learn about a certain step in a procedure when it is not mentoned in the chapter we are studying but in the next?" This even when I mentioned it weas not in that chapter, and I went through the steps with them, and demonstrated this to them. When students start distorting, this becomes a challenging task for the instructor, to keep them focused to stay with the subject.