The document discusses the classification of academic disciplines into four main categories:
1) Hard disciplines like physics and chemistry use quantitative data and experimental methods.
2) Soft disciplines like language and anthropology use qualitative data from surveys and case studies.
3) Pure disciplines like pure mathematics focus on fundamental research and discovery.
4) Applied disciplines like engineering apply existing knowledge to solve real-world problems.
Disciplines can also be classified as hard-pure, hard-applied, soft-pure, or soft-applied based on whether they use quantitative/qualitative data and focus on fundamental research or applications.