Imagine a world in which microsurveys are useful and widely used.

Imagine a world in which highly active users also don't get interrupted by a survey on every page.

If we want to have more than one survey running on the same wiki, we'll need a central control system that limits the overall rate at which any survey is displayed to a given user.

Simple example: 1,000 surveys are active. Each survey has a 1% chance of being shown. Unwanted result: If I read or edit 100 pages today, then I see ~100 surveys. Desired result: If I read or edit 100 pages today, then I see 1 survey. (And if I answer it, then I won't see any tomorrow.)