The Bayley Scales: Measuring infant development

The Bayley Scales are a suite of IQ-like tests for babies and young children. They're used to assess infant development. But the latest edition of the tests, the Bayley-III, seems to produce higher test scores than its predecessor, the Bayley-II. This is causing problems for researchers like Neil Marlow who use the tests to check the effectiveness of different interventions. Neil decided to compare the two tests. He talks about the results of his study, and its implications, on this month's podcast.

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