A competency is a cluster of highly interrelated attributes, including knowledge, skills, and abilities (KSAs) that give rise to the behaviors needed to perform a given job effectively.
Competencies can be either technical or behavioral. Technical competencies reflect the knowledge required to perform a specific role. Behavioral Competencies describe the KSAs that facilitate the application of technical knowledge to job-related behavior. In other words, technical competencies reflect what knowledge HR professionals apply to their jobs, and Behavioral Competencies reflect how they apply this knowledge.
A competency model is a set of competencies that collectively defines the requirements for effective performance in a specific job, profession, or organization. There are eight Behavioral Competencies and one Technical Competency, HR Expertise (HR Knowledge) in the SHRM Competency Model, which forms the foundation of the SHRM BoCK.