The document analyzes the effects of quality incentives in public transport contracts in Stockholm, Sweden. It finds that the quality incentives studied did not reliably improve quality outcomes for commuter trains or buses. Only 4 out of 10 incentives showed the expected effect on quality, with only 1 being statistically significant. The results were inconclusive likely because the costs of improving quality were higher than the incentives. Higher quality may not be optimal if costs are greater than what passengers are willing to pay.