I have downloaded the newest versions of the model document to ftp://pwg/pub/ipp/new_MOD/ipp-model-1.3-rev.doc and ftp://pwg/pub/ipp/new_MOD/ipp-model-1.3-rev.ps The changes are all marked with revision marks and are primarily in sections 4 and 5. Section 5.1 still needs work. Bob Herriot