There are a variety of training programs dedicated to providing mental health treatment and each has their own unique title–psychologist, social worker, marriage and family therapist, mental health counselor, substance use disorder counselor, and psychiatrist. While all focus on diagnosis and treatment of mental health conditions, each can vary in what they emphasize or how they approach and treat a mental health problem. For example, marriage and family therapists tend to approach client problems by looking at the system that surrounds the individual/couple/family. Psychiatrists (and psychiatric nurse practitioners) are trained from a medical model perspective and they prescribe medication. Regardless of the training or emphasis, the relationship or therapeutic alliance has been found to be a common and necessary factor in making progress in mental health treatment.