Historically, what was the main concept that school psychology emphasized more than clinical child psychology?

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The main concept that school psychology emphasized more than clinical child psychology historically was the focus on behavioral and learning difficulties. School psychologists worked within educational settings and their primary focus was on addressing academic challenges and promoting behavioral and social-emotional development within the school context, rather than providing treatment for diagnosable mental disorders or personality disorders.

Historically, What Was the Main Concept That School Psychology Emphasized