The word cohort is used to describe:
Groups of individuals born within a narrow span of years who shared experiences at the same times in their lives.
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The three very broad families of psychological theories are:
Psychoanalytic, learning, and cognitive development
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Your question, "Developmentalists compare theories with respect to their usefulness. There is a fair amount of disagreement among psychologists as to how useful each theory is..." was sent to the Mental Health category where I believe it was answered.