For art prints, the primary support is usually paper. If the print is in a frame, the frame is the secondary support. If the print is dry mounted and matted, the mounting and mat board are secondary supports. You may not be able to determine the composition of primary and secondary support materials. If in doubt, do not enter codes for support material in the 007 field.
Kits are items containing two or more categories of material, no one of which is predominate.
Apply the same rules and definitions to 007 fields used in kit records as you would to 007 fields used individually in other records. Because it is not associated with any projected material, you catalog the sound disc as a sound recording using a separate 007 field for sound recordings. Catalog the sound cassette as accompanying material in the 007 field for the filmstrip because the cassette is associated with the filmstrip. Catalog the 35 problem cards in a separate 007 field. Do not use an 007 field for the book, booklets, game, or teacher's guide because no 007 fields apply to those parts.