| LIST I (Theory) | LIST II (Proposed By) | ||
|---|---|---|---|
| A | ‘g’ Factor Theory | I | Guilford |
| B | Hierarchical Theory | II | Spearman |
| C | Multifactor Theory | III | Vernon |
| D | Cubical Model | IV | Thurstone |
The primary intelligence theories and their originators include:
| List I (Book/Theory proposed/Characteristic, etc.) | List II (Author/Thinker/Name of Theory, etc.) |
|---|---|
| (A) Two-Factor Theory | (I) G.H. Thomson |
| (B) Group Factor Theory | (II) Spearman |
| (C) Sampling Theory | (III) Thurstone |
| (D) Hierarchical Theory | (IV) Vernon |