Let's say you want to do a market-related study in which you gain entry to one thousand homes representing sets of people defined by the usual variables of income, ethnicity, urban-suburban lifestyle etc. The first thing you do is to ask a few people, real nice like, if you can go through their stuff and take a lot of photographs and notes. Most of them say no, and you perhaps even discover that the one or two who actually agree to this are odd ducks. So you go to Plan B. This involves breaking into the homes when the people are out so you can get your data despite the fact that they don't…
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