The preliminary OChem book I am playing with has trains of continuity, although they are more flexible than in a printed book. Its a flexibility to link to all related subjects that I wish the textbooks that I use had. I dont think that most people would confuse an interlinked textbook with an encyclopedia, as a textbook seeks to actively teach, where an encyclopedia presents information more passively. Plus there is an overlying scheme of nested links that adds structure. But thats just how I see this book on this subject turning out right now, and is no comment on any other book or any other way or etc. I guess a textbook as I see it should help lead a person thru the subject even if it gives him freedom to change direction. Isnt learning more fun for you as a learner when you have some say on how you do it ? __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com _______________________________________________ Textbook-l mailing list Textbook-l(a)wikipedia.org http://mail.wikipedia.org/mailman/listinfo/textbook-l