When assessment interferes with the measured

There was a time, not so long ago, when no scientific presentation could afford to omit at least one cartoon from The Far Side. One of my personal favourites (which can be seen here) depicts people of an apparently remote part of the world hiding their luxury Western goods as anthropologists arrive unannounced in the village.

I was reminded of this cartoon recently whilst washing my hands at work. This surprising mental leap was prompted by the temporary addition of a tool for monitoring water consumption in one of our buildings.

Can the method of assessment interfere with the thing it is supposed to be measuring?

Can the method of assessment interfere with the thing it is supposed to be measuring?

As can be seen in the photograph, the equipment being used scores few points for subtlety. I cannot believe that people use their usual amounts of water when confronted by this instrument. This raises the question of their value given that the method of monitoring is almost certainly interfering with the thing that is being measured. Continue reading

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