If you know the target group for your survey, you can also find out which media people in the group use.
Surveys can now be carried out in many different ways and places, such as via email, SMS, digital mail, QR codes and social media. And you can easily use several channels at the same time. When you hit the target group on the platform they are using, you increase the likelihood of them seeing your message and having the time and inclination to respond.
If it's possible for them to answer when they are sitting in the train on the way to or from work, perhaps the recipient should receive an email early in the morning or in the afternoon after work.
In other situations, you may be aware that you are sending emails to work addresses. In that case, sending an email at lunchtime may well increase the response rate.
What all of the methods have in common is that the more options for ways to respond you can give respondents, the more likely they are to do it. So, as an example, consider whether a conventional invitation email should be followed up with a reminder via SMS. You'll be surprised by how this affects results.