m1469 is right. In general, within actual forum rules, people must be free to post anywhere they feel they can make a contribution. In that sense, I have always taken the heading "Teachers' Forum" loosely and more in the sense of "Teaching Forum", that is to say a forum about teaching rather than an exclusive rule about who may post there. I suppose I am incorrect according to the letter, but I tend to think it doesn't matter a great deal here. On the other hand if a poster stated he or she wished to have replies from teachers only, or indeed, from some other group of people which excluded me, then I would stay out of it. I think we should all just use common sense and give and take.