Passage Summary: Car designers learn more by talking to people than by reading surveys because surveys tell you what's wrong but don't give you the solution.

Conclusion: Direct interaction between designers and consumers is more effective than relying on survey data for improving car features.

Reasoning: While surveys can identify problems with past models, they lack the prescriptive power to explain exactly how to improve those features for the future.

Analysis: The argument is advocating for a specific method of gathering information based on its utility for future action. We need a principle that supports choosing a method that provides solutions over one that merely identifies problems. Look for a proposition that prioritizes 'how to improve' over 'what was wrong.' The focus is on the superiority of prescriptive information over descriptive data.