>>If I recall correctly it was a time study of the number of filing actions (retrievals and refiles) that were completed using the various filing/shelving type systems available.<< I remember the study. I did find reference to it at the following website: http://www.reynoldsbusiness.com/storage%20systems%20-%20vertical%20carou sels.htm I would suggest contacting them to see if they have a copy. Bill R List archives at http://lists.ufl.edu/archives/recmgmt-l.html Contact [log in to unmask] for assistance