Hierarchy of Preferred Terms for NASA STI Subject Categories

• NASA STI Subject Categories
• Aeronautics
• Aerodynamics
• Aeronautics (General)
• Air Transportation and Safety
• Aircraft Communications and Navigation
• Aircraft Design, Testing and Performance
• Aircraft Propulsion and Power
• Aircraft Stability and Control
• Avionics and Aircraft Instrumentation
• Research and Support Facilities (Air)
• Astronautics
• Astrodynamics
• Astronautics (General)
• Ground Support Systems and Facilities (Space)
• Launch Vehicles and Launch Operations
• Space Transportation and Safety
• Spacecraft Design, Testing and Performance
• Spacecraft Instrumentation and Astrionics
• Spacecraft Propulsion and Power
• Chemistry and Materials
• Chemistry and Materials (General)
• Composite Materials
• Inorganic, Organic and Physical Chemistry
• Metals and Metallic Materials
• Nonmetallic Materials
• Propellants and Fuels
• Space Processing
• Engineering
• Communications and Radar
• Electronics and Electrical Engineering
• Engineering (General)
• Fluid Mechanics and Thermodynamics
• Instrumentation and Photography
• Lasers and Masers
• Mechanical Engineering
• Quality Assurance and Reliability
• Structural Mechanics
• General
• General.
• Geosciences
• Earth Resources and Remote Sensing
• Energy Production and Conversion
• Environment Pollution
• Geophysics
• Geosciences (General)
• Meteorology and Climatology
• Oceanography
• Life Sciences
• Aerospace Medicine
• Behavioral Sciences
• Exobiology
• Life Sciences (General)
• Man/System Technology and Life Support
• Mathematical and Computer Sciences
• Computer Operations and Hardware
• Computer Programming and Software
• Computer Systems
• Cybernetics, Artificial Intelligence and Robotics
• Mathematical and Computer Sciences (General)
• Numerical Analysis
• Statistics and Probability
• Systems Analysis and Operations Research
• Theoretical Mathematics
• Physics
• Acoustics
• Atomic and Molecular Physics
• Nuclear Physics
• Optics
• Physics (General)
• Physics of Elementary Particles and Fields
• Plasma Physics
• Solid-State Physics
• Social and Information Sciences
• Administration and Management
• Documentation and Information Science
• Economics and Cost Analysis
• Law, Political Science and Space Policy
• Social and Information Sciences (General)
• Technology Utilization and Surface Transportation
• Space Sciences
• Astronomy
• Astrophysics
• Lunar and Planetary Science and Exploration
• Solar Physics
• Space Radiation
• Space Sciences (General)