| Type | Philosophical concept |
| Origin | |
| Criticism | Controversy • Oversimplification • Limited applicability |
| Supporters | Modern philosophers • Pragmatists • Individualists |
| Core principle | Adaptable thinking and flexibility |
| Field(s) of application | Philosophy • Politics • Business • Relationships • Pop culture |
| Metaphorical significance | Quacks like a duck, looks like a duck – it's probably a duck |
