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This article discusses an experiment run at the beginning of an effort to substantially enlarge the RAND American Teacher Panel, a nationally representative sample of K-12 public school teachers. Ten strategies were evaluated. We considered different modes of contact (FedEx vs. US Postal Service \[USPS\]), contingency status of incentives (pre- vs. promised incentive), amounts of incentive ($2, $10, $40, or $60), and types of incentive (cash, check, gift card, electronic). Strategies were compared in terms of response rate and cost effectiveness. Our study yielded several findings that should advance the literature: The use of FedEx clearly outperforms USPS, and the use of a moderate preincentive ($10) outperforms much larger promised incentives (up to $60) with respect to both responsiveness and cost-effectiveness. In addition, cash and check seem preferable to gift cards. Finally, we assess the potential for nonresponse bias by comparing enrollees to nonresponders across a variety of demographic characteristics for each strategy.

The Effect of Incentives and Mode of Contact on the Recruitment of Teachers into Survey Panels