Data errors due to question non-responses may exist. The number of respondents who choose to respond to a survey question may be different from those who chose not to respond, thus creating bias.
Survey question answer options could lead to unclear data because certain answer options may be interpreted differently by respondents. For example, the answer option “somewhat agree” may represent different things to different subjects and have its own meaning to each individual respondent. ‘Yes,’ or ‘no’ answer options can also be problematic. Respondents may answer “no” if the option “only once” is not available.
Customized surveys can run the risk of containing certain types of errors
Respondents may not feel comfortable providing answers that present themselves in an unfavorable manner.
Respondents may not be fully aware of their reasons for any given answer because of a lack of memory on the subject, or even boredom.