The use of pre-notification letters is thought to increase the response rate of postal surveys. The empirical evidence for that claim, however, is not conclusive. In this research note we assessed the impact of pre-notification by means of data from a large-scale survey-experiment conducted in Flanders (N: 4000). Three outcomes were studied: overall response rate, timing of the response and quality of the response. No significant positive impact was found on the overall response rate and quality of response. However evidence indicated that respondents who received a pre-notification letter were more inclined to respond earlier.
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