Multimodal therapy originated within the context of behavior therapy and, later, the framework of cognitive behavioral therapy ("CBT"). Indeed, Arnold Lazarus introduced the terms "behavior therapy" and "behavior therapist" into the professional literature in 1958. During his pioneering work in the clinical arena of CBT, Arnold Lazarus realized that more areas of psychosocial functioning often needed to be addressed in therapy than merely actions and thoughts. This led him to expand the model of traditional CBT by incorporating additional modalities for assessment and treatment. This was briefly referred to as "broad-spectrum behavior therapy," and ultimately became multimodal therapy.