Limitations to survey research?

curious

New member
Writing a thesis and need to list limitations of my study. I'm giving short questionnaire to foodservice workers/managers asking them to rate their supervisors leadership ability. So far I have (for limitations):
1) using contract mgmt. coompany only (as opposed to self op.)
2) using only 1 healthcare network
3)? Questionnaire is subjective? Respondents may not answer truthfully/acurrately?

Someone have a better way of explaining #3

Thanks a lot!
 
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