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Attaining Expertise Essay Preview: Attaining Expertise Report this essay Attaining ExpertiseLeAnn CarthelPSYCH 640December 7, 2015Christopher WessingerAttaining ExpertiseExpertise is defined as a special skill of knowledge that an individual acquires from experience or continuous study. It is knowledge and understanding of a subject to the fullest. To be an expert, one must know a subject inside.