Measures the relationship between an individual's quality of life and other behaviors or afflictions such as physical health, psychological health, and alcohol or substance use.
A–level products do not require any specific qualifications.
B–level products require that the user has completed graduate–level courses in tests and measurement at a university or has received equivalent documented training.
C–level products require fulfillment of b–level qualifications, and users must have training and/or experience in the use of tests and must have completed an advanced degree in an appropriate profession (e.g., psychology, psychiatry). Depending on state requirements, membership in a relevant professional organization (e.g., APA) or a state license/certificate in psychology or psychiatry may be necessary.
