There are no medical tests for diagnosing abnormal behavior that might need therapy. Instead, therapists rely on subjective judgments. Mental health disorders are classified using the DSM-5 or IDC based on symptoms, on a continuum from normal to abnormal. Therapists can be distinguished by their educational degree requirements. There are many general approaches to therapy, based on their assumed causes of abnormal behavior. There are some common factors in effective therapy across approaches. Approaches to couples therapy include general approaches and specific approaches. Singles Counseling Theory (SCT) emphasizes autonomy and relatedness. A major goal of SCT is to help individuals make informed choices about their interpersonal relationships across the lifecycle.