Sure we can make a page per topic, if people would think that would be easier to use. I was thinking of organizing pages with topic tags, because it seemed more flexible. However maybe people would be more comfortable with a hierarchical structure. It would also be easier to look at all the problems about, say, graphing lines on one page, and copy and paste them into your document in one shot. What do people think? And George, would you be interested in setting up topic pages (that people could add to or modify should the need arise)?