The research also offers suggestions for reducing noise and bias. We will not review them exhaustively here, but we will focus on two noise-reduction strategies that have broad applicability. One is an application of the principle we mentioned in chapter 18: selecting better judges produces better judgments. The other is one of the most universally applicable decision hygiene strategies: aggregating multiple independent estimates. The easiest way to aggregate several forecasts is to average them. Averaging is mathematically guaranteed to reduce noise:
