Case context: An x-ray diagnosis project has four human baselines: 15% for a typical person with basic training, 10% for a junior doctor, 5% for an experienced doctor, and 2% for a small team that debates each image. Stakeholders propose 5% as the desired error rate.

Question: Diagnose the problem with the proposed target and recommend the human-level proxy and desired error rate supported by the evidence.

Sample answer: The 5% proposal uses the experienced individual doctor rather than the best achievable human baseline. Because the doctor team achieves 2% error, 5% is too high as the human-level proxy and desired performance level. The project should use 2% as its reasonable proxy and desired error rate, while allowing that the true optimal error could be lower.

Key points:

• A team outperforms the experienced individual doctor.
• The proposed 5% target is higher than an achievable 2% result.
• Use 2% as the human-level and optimal-error proxy.
• The actual optimal error could be below 2%.

Rubric: The response should reject 5% using the team evidence, recommend 2% for both the proxy and desired performance, and avoid claiming that 2% must equal the true optimal error.