Psychiatrists and diverse other mental health and broader healthcare professionals are faced with many challenges in effectively evaluating and treating persons with psychiatric illnesses and substance use disorders. Resources are often stretched thin, especially for those with the most serious and disabling conditions, and many people who would benefit from treatment are untreated, undertreated, or treated only after extended delays for complex reasons. Clinicians clearly have difficulties and barriers in their efforts to provide comprehensive, efficacious, and timely treatment. Despite the challenges, this book encourages mental healthcare providers to expand their clinical practices, or the orientation or guiding principles of.