Thanks to Jim Warner for pointing out just how tangled they were. There was a bug in the software that we have been using to present the on-line discussions via the Web site. As a result the "thread" index didn't show messages in their logical threads. Sometimes it did, but half the time it organized things incorrectly. Please take another at these indices, which have been reconstructed after the bug was fixed. They provide a useful snapshot of the ongoing discussion. While I am talking about technicalities, I should mention a few points related to this thread structure. You have no doubt noticed that messages from the list appear with a "From:" line indicating the original sender. This means that a simple reply will send your response back to the sender alone. If you want to reply to the list as a whole, you can use a "group reply" or "reply to all recipients" command. The way this works is that your mailer will pick up the "To:" line and the "Cc:" from the original message, one of which will specify us-nd@info-ren.pitt.edu, which is the address of the mailing list itself. The thread index is constructed by looking to see if a given message was issued through a reply command, as described above. Typically, the reply will use the same subject line as the original message, prefixed by "Re:". You can change the subject line in your reply, perhaps to focus the discussion a little bit, but keep in mind that any reply will show up in the same thread. This means that it can be confusing if you use a reply command just to avoid typing the full address of the mailing list. Thanks to Jim for pointing out this particular glitch, which must have been bothering many of you, at least subliminally. I know that after Jim pointed out the problem I realized that the threads had been looking weird, but somehow they hadn't been weird enough to catch my attention. Those of you with an eye for such things should send notes to info@info-ren.pitt.edu if you spot other items that need to be fixed. Thanks for your help - and for your tolerance of the occasional slip-up. Bob Carlitz Moderator