Post-treatment follow-up inquiries suggest that many relapses would be avoided if the therapy were broad-based. Whereas several systems adhere to the assessment and treatment of three major areas—Affect, Behavior, and Cognition (ABC)—the multimodal spectrum emphasizes seven interactive modalities—Behavior, Affect, Sensation, Imagery, Cognition, Interpersonal relationships, and Drugs/Biological processes. The first letters yield the convenient acronym BASIC I.D. Multimodal therapy (MMT) rests on the theoretical underpinning of social and cognitive learning theory because its tenets are open to verification or disproof. It strongly favors technical eclecticism and eschews theoretical integration. Whenever feasible, empirically supported methods are employed. The BASIC I.D. format lends itself to several distinctive procedures. Bridging enables a clinician to ease the patient into important territory that would otherwise be avoided. Tracking the Firing Order permits the therapist to identify how a given patient is apt to generate emotional upsets, and suggests a specific treatment trajectory for dealing with these untoward reactions. Second-Order BASIC I.D. Assessments can ‘magnify’ certain elusive problems so that solutions are more likely to be found. Various multimodal assessment instruments have been developed and their reliability and validity have been established. There is suggestive evidence that covering the BASIC I.D. enhances follow-ups.