On the authority searching screen there are three tabs, Search Authorities/Search Main Heading/Search All Headings. At present the first two appear to generate the same zebra search while the third generates a search with the unrecognized attribute 'Any'. 'search Main Heading' sounds more like a Bib search than an authority search. Has anyone any pointers on what we think these should be doing? If there is some agreement I'll try and get theory and practice to correspond a bit more closely Cheers Colin -- Colin Campbell Software Engineer, PTFS Europe Limited Content Management and Library Solutions +44 (0) 208 366 1295 (phone) +44 (0) 7759 633626 (mobile) colin.campbell@ptfs-europe.com skype: colin_campbell2 http://www.ptfs-europe.com