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The primary objection to debiasing-training interventions is a lack of evidence that they transfer to improved decision
making in field settings, where reminders of bias are absent. We gave graduate students in three professional programs
(N = 290) a one-shot training intervention that reduces confirmation bias in laboratory experiments. Natural variance
in the training schedule assigned participants to receive training before or after solving an unannounced business
case modeled on the decision to launch the Space Shuttle Challenger. We used case solutions to surreptitiously
measure participants’ susceptibility to confirmation bias. Trained participants were 29% less likely to choose the
inferior hypothesis-confirming solution than untrained participants. Analysis of case write-ups suggests that a reduction
in confirmatory hypothesis testing accounts for their improved decision making in the case. The results provide
promising evidence that debiasing-training effects transfer to field settings and can improve decision making
in professional and private life.