In 1999 I wrote a pretty long (12000 words) review article on a certain subject, about which I've now been asked to contribute an encyclopedia entry which really does cover most of the same ground with certain tweaks. If I use my existing article as a template, editing and altering where needed in order to meet the newer criteria (they are practically the same) and for length, am I self-plagiarizing?? I have been getting very stuck on this one small project worrying about this, but I have to get it done because I have a lot of other things I have to finish this summer. What do you guys think?