What action is most effective in increasing response rates for mailed surveys?

Sending a follow-up email or letter is a highly effective strategy for increasing response rates for mailed surveys. Follow-up communications serve as reminders for recipients who may have overlooked the initial survey request or forgotten to complete the survey. This nudge can enhance their awareness and prompt action, ultimately leading to higher participation rates.

In addition to acting as a reminder, follow-ups can provide an opportunity to reiterate the importance of the recipient's input, thereby increasing their motivation to respond. They can also address any potential concerns recipients may have about the survey, encouraging them to take the time to fill it out.

While other options may also contribute to improving response rates, such as reducing survey length or offering incentives, the reminder aspect of follow-up communications specifically targets the issue of overlooked requests, making it a particularly powerful method.