They study abstract systems, they don't depend on direct empirical observation.

• Mathematics
• Logic
• Statistics
• Systems Theory
• Theoretical Computer Science
• Information Theory
• Theoretical Cryptography
• Foundations of Mathematics

Natural and exact sciences.

• Physics
• Chemistry
• Biology
• Earth Sciences
• Astronomy

Health sciences and medicine.

• Medicine
• Nursing
• Pharmacy
• Dentistry
• Clinical Psychology
• Public Health
• Biomedical Sciences

Study of society and human behavior.

• Sociology
• Economics
• Political Science
• Anthropology
• Demography
• Human Geography
• Law

Study of the human being and culture.

• Philosophy
• History
• Literature
• Linguistics
• Cultural Studies
• Religion and Theology
• Ethics

Application of science and technology.

• Engineering
• Technology and Innovation
• Applied Computing
• Architecture
• Biotechnology
• Robotics
• Artificial Intelligence
• Nanotechnology

Artistic expression and creativity.

• Visual Arts
• Music
• Performing Arts
• Design
• Film and Audiovisual
• Photography
• Fashion

Teaching and pedagogy.

• General Education
• Pedagogy
• Didactics
• Educational Psychology
• Special Education
• Vocational Training

Economics, business and administration.

• Business Administration
• Finance
• Accounting
• Marketing
• Commerce
• Entrepreneurship
• Applied Economics

Emerging fields and interdisciplinary knowledge.

• Environmental Studies
• Neuroscience
• Cognitive Science
• Gender Studies
• Bioethics
• Data Science
• Futures Studies