1. Spearman's Two-Factor Theory:
- Proposes two types of intelligence:
- General intelligence (g): Underlying ability factor present in all cognitive tasks
- Specific intelligence (s): Ability specific to particular tasks
2. Thurstone's Primary Mental Abilities Theory:
- Identifies seven primary mental abilities:
- Verbal comprehension, perceptual speed, numerical ability, spatial visualization, inductive reasoning, memory, and verbal fluency
3. Guilford's Structure of Intellect Model:
- Most comprehensive theory, classifying intelligence into 150 different factors based on three dimensions:
- Operations (what we do with information): Cognition, memory, production, and evaluation
- Contents (what we deal with): Visual, auditory, symbolic, semantic, and behavioral
- Products (the result of operations on contents): Units, classes, relations, systems, transformations, and implications
4. Gardner's Multiple Intelligences Theory:
- Proposes eight distinct intelligences:
- Linguistic, logical-mathematical, musical, bodily-kinesthetic, spatial, interpersonal, intrapersonal, and naturalistic
5. Sternberg's Triarchic Theory:
- Three types of intelligence:
- Componential intelligence: Knowledge and skills for problem-solving
- Experiential intelligence: Ability to deal with novel situations
- Contextual intelligence: Ability to adapt to different environments
6. Cattell-Horn-Carroll Theory (CHC):
- Developed by Raymond Cattell, John Horn, and John Carroll
- Hierarchical model with three main levels:
- Broad abilities (e.g., fluid intelligence, crystallized intelligence)
- Narrow abilities (e.g., processing speed, quantitative reasoning)
- Specific abilities (e.g., visual scanning, letter recognition)