Abstract
Lack of data, suitable to be used by designers of daily-life products, was a reason to start a national study on physical, psychomotor and behavioral characteristics of children between 2 and 13 years of age in the Netherlands. Data were gathered on several variables, one of them being technical comprehension. A measuring method was developed to measure knowledge of some commonly used compatibility rules. The results from almost 1000 children showed that age differences can be found at the ages between 5 and 9. For some of the youngest children the test appeared to be just a funny game, while for the older children the test might have been too childish. Influence was found for type of control. Direction of movement and orientation of the control had little influence on the results.
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