Solutions Based on personal decision rather than on regulations has 4 entries with similar clues
- 5-letter words
- hunchA belief that something is true based on a feeling rather than evidence
- 8-letter words
- a-prioriReasoning from first principles (Latin)/reasoning based on theory rather than observation
- 9-letter words
- empiricalBased on observation rather than pure logic
- 13-letter words
- rule-of-thumbA fairly accurate guide based on practice rather than theory