Nielsen will issue "TV Diaries" to both "households" and "families."
If you're polled as a houshold, a TV Diary is issued for each TV you have, and then you're supposed to record everything that gets watched on the TV in the little booklet.
If you're polled as a family, a TV Diary is issued for each individual in your family, and then you're each supposed to record everything you watch on any TV in the little booklet.
We got polled as a household. The diary was for one week. They called us at the end to remind us to mail it back.
I would presume they do the same sort of thing with other media.
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Simple Machines in Higher Dimensions
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