Our municipality has contracted a survey firm to evaluate the after-school activities for children that it supports. Circus school, piano lessons etc. Questionnaires have been sent to (some? all?) enrolled children.
My kid is in three of these activities. I got three almost identical questionnaires, interpreted them as a mail-merge glitch, responded to one and threw two away unexamined. Then I was nagged about those two.
If I were running the survey I would purposely avoid collecting data on the same kid for more than one activity.