In reply to TheDoctor inquiry re flow charts. I've been using the annotate feature of EN to make my flow charts. I open a note give it a title, but I leave the body of the note blank. Then, I click annotate as a pdf. Then I use the boxes, arrows, lines, text features, change colors, etc. While its not as easy as a sketch pad, easel and a marker, I am getting the hang of it. For studies at the university level--where you might have to simplify complex textual material, i it may do the trick, until EN comes up with a better idea.