Similarly, this document can be used to create, assess, or accredit certifications or other cre-dentials programs for PSP practitioners. Certification programs provide individuals with documentation attesting that those individuals have attained a well-defined and objectively-measured level of proficiency in a particular field of discipline, as defined by a core set of knowledge and skills. Individuals who successfully demonstrate their proficiency—usually measured by performance on a standardized assessment instrument, and marked by awarding of a credential or certification—are regarded as competent, skilled professionals with a dem-onstrated level of mastery in the competencies delineated by their profession’s body of knowledge.