There are several smart techniques for controlling the distribution of surveys to recipients. Here are some of them described at a high level:
Blocking Rules
The most common and necessary in all ongoing surveys. To avoid sending surveys too often to the same recipient, techniques can be used to ensure that the same recipient does not receive the survey too frequently. It is common to have a rule that prevents the same person from receiving a new survey within 30 days either from the same survey or from another survey.
Drip Campaigns
Previously, large customer and employee surveys were often conducted at one time. Nowadays, surveys are instead sent to a few recipients at a time to constantly listen to what customers think. It also becomes much easier to act on what comes in if it becomes part of the ongoing work, a good way to do this is through continuous distribution to the same distribution list.
Rotating Questions (Carousel)
It is possible to vary the questions asked in the survey so that the recipient receives certain questions at one time and different questions at the next time. The advantage is that the survey does not become as rigid and that you continuously receive answers to many different questions without having to have a long survey. The system can keep track of how many times the person has received the survey before and switch to a different set of questions than last time.
A/B Testing
By having several different versions of the survey or invitation and distributing so that some recipients receive one version and others receive the other version, you can test which version has the best effect on, for example, response frequency.