Survey fatigue definition:
Survey fatigue (often used interchangeably with respondent fatigue) is a problem that occurs when survey respondents become bored or tired during the survey and begin to perform at a substandard level and start providing less or incorrect data.
In general we can identify two types of survey fatigue:
Survey Response Fatigue: This occurs before the survey begins. Overwhelmed by the growing number of surveys, respondents will be less inclined to take part in your survey. As a result, you’ll suffer from a low response rate.
Survey Taking Fatigue: This type of respondent fatigue happens during the survey. It’s the result of surveys that are perceived as too long and include questions irrelevant to the respondent. An indicator of survey taking fatigue can be found in a low completion rate.