As an ABA therapist assistant, you use the principles of applied behavior analysis (ABA) to provide treatment and support for each patient you work with. In this role, you may use advanced screening techniques to ensure a comprehensive assessment, determine the baseline of each patient, and help select the best types of therapies. ABA therapist assistants usually work under the direct supervision of an experienced therapist, so fulfilling the responsibilities and duties of this role requires communication skills and the ability to work while taking directions. The daily duties of a therapist assistant can vary from office to office, so the ability to flexibly adapt to changing circumstances and the ability to take classes to meet new qualifications as needed is essential to this role.