At present, the polymer literature lacks a widely applicable, internally consistent and easily recognizable system for classifying polymers. Such system should embrace not only polymers that are already known, but also those that will be synthesized in the future. The classification scheme presented here facilitates logical indexing including indexing through the use of computer techniques for information storage and retrieval. At the present time, the scheme is limited to linear single-strand organic and inorganic polymers. It is consistent with previous IUPAC recommendations.