To all the contributors of the MDS discussion, thanks a lot for your help. I learned a lot from that debate and got very helpful hints, even if some aspects you discussed are beyonde my scope. It seems there is no simple answere to what I (in the first place) thought to be a simple question. Anyway I found the argument concerning metric vs. nonmetric MDS helpful and of corse the various pointers on which programs to use, their fit properties etc. Even if I cantīt consider all your suggestions I am a great deal further to solve that task. It might be that setting up my own code might be more than I can do, but using available software I can still try to keep the black box as small as possible, and not the least due to this list. yours, dirk