Document Type


Publication Date


Publication Title

NASA Technical Memorandum: 208955




The purpose of this paper is to describe the new subject classification system for the NCSTRL+ project. NCSTRL+ is a canonical digital library (DL) based on the Networked Computer Science Technical Report Library (NCSTRL). The current NCSTRL+ classification system uses the NASA Scientific and Technical (STI) subject classifications, which has a bias towards the aerospace, aeronautics, and engineering disciplines. Examination of other scientific and technical information classification systems showed similar discipline-centric weaknesses. Traditional, library-oriented classification systems represented all disciplines, but were too generalized to serve the needs of a scientific and technically oriented digital library. Lack of a suitable existing classification system led to the creation of a lightweight, balanced, general classification system that allows the mapping of more specialized classification schemes into the new framework. We have developed the following classification system to give equal weight to all STI disciplines, while being compact and lightweight.

Original Publication Citation

Tiffany, M.E., & Nelson, M.L. (1998). Creating a canonical scientific and technical information classification system for NCSTRL+. NASA Technical Memorandum: 208955. Hampton VA: NASA Langley Research Center.


0000-0003-3749-8116 (Nelson)