The Principle of Independent Judgments and Decorrelated Errors

The procedure i adopted to tame the halo effect conforms to a general principle decorrelate error. To derive the most useful information from multiple sources of evidence, you should always try to make these sources indeendent of each other. When there are multiple witnesses to an event, they are not allowed to discuss it before giving their testimony. The goal is not only to prevent collusion by hostile witnesses but also to prevent unbiased witnesses from influencing each other.