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The authors evaluate the results of a field experiment designed to measure the effect of prompts to form implementation intentions on realized behavioral outcomes. The outcome of interest is influenza vaccination receipt at free on-site clinics offered by a large firm to its employees. All employees eligible for study participation received reminder mailings that listed the times and locations of the relevant vaccination clinics. Mailings to employees randomly assigned to the treatment conditions additionally included a prompt to write down either the date the employee planned to be vaccinated or the date and time the employee planned to be vaccinated. Vaccination rates increased when these implementation intentions prompts were included in the mailing.
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