This document provides a brief review of competency definitions, development, and assessment. It discusses the origins of competency concepts in the 1970s and defines competency as observable attributes or success factors required for effective job performance, including knowledge, skills, traits, and motives. The document outlines various competency definitions proposed by different scholars and notes there is no consensus definition. It also distinguishes between the related terms "competency" and "competence" and describes different approaches to classifying competency dimensions. Finally, it states that competency development is important for competency management and outlines some processes, guidelines, and techniques used for developing competencies for specific jobs or professions.