Sturgeon's Law
Ninety percent of everything is crud — used to push past surface dismissal.
Sturgeon's Law (or Sturgeon's Revelation) was articulated by science-fiction writer Theodore Sturgeon in defense of his genre against critics who dismissed it on the basis of weak examples. Sturgeon's response, presented at a 1951 World Science Fiction Convention and elaborated in print thereafter, was that 'ninety percent of everything is crud' — and that judging any genre, field, or category by its worst examples is unfair because the same is true of literary fiction, classical music, philosophical writing, or any other category. The fair test is to compare the best of any category against the best of others, not the average against the average. The principle is now widely cited beyond science fiction as a heuristic for evaluating fields, genres, methodologies, and bodies of work — the exhortation to engage with the strongest representatives rather than dismissing on the basis of bad examples. The 'ninety percent' figure is approximate and somewhat arbitrary; the underlying point is that mediocre examples are the norm in any sufficiently large category, and selection effects (which examples are sampled, what counts as 'representative') drive most apparent differences in quality between fields. The principle is a useful complement to steelmanning, both encouraging engagement with strong rather than weak versions of a position or field.
Core components
- Ninety percent of any field is mediocre or worse
- Fair comparison requires best-vs-best, not average-vs-average
- Heuristic against dismissing fields by their weakest examples
- Connection to selection effects in sampling representative work
- Complement to steelmanning
- Application across genres, fields, methodologies
Primary use case
Heuristic for fair evaluation of fields, genres, and bodies of work; debiasing against dismissive sampling; intellectual-honesty practice in cross-disciplinary engagement; complement to steelmanning in argument; reference in intellectual-culture discussions about fields, genres, and methodologies; pedagogical tool for teaching fair evaluation.
Common criticisms
- The specific 'ninety percent' figure is approximate and not empirically grounded
- what counts as 'crud' is contested and value-laden
- the principle can be deployed to deflect legitimate criticism of a field as a whole when its problems are systemic rather than individual-quality variation
- some fields' best examples may genuinely be substantially worse than other fields' best examples — the principle doesn't preclude legitimate cross-field quality comparison
- like other 'razors,' Sturgeon's Law is a heuristic that doesn't substitute for substantive engagement
- can become a rhetorical move ('you're judging us by our weakest examples') without actual best-of-field engagement.
Lineage
- Siblings
- Occam's Razor, Hanlon's Razor, Steelmanning