The scientific method approach is the best guide for testing and refining theories of life-span development.
A German psychologist known to be Paul Baltes was the one who created one of the methods to studying the growth called the lifespan perspective.
Note that a the above method is seen as the method of research where the problem is known, relevant data are taken, a hypothesis is made from a lot of data, and the hypothesis is said to be empirically tested
Hence, The scientific method approach is the best guide for testing and refining theories of life-span development.
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