There are 3 levels of clinicians on an IBI team: instructor therapists, Senior Therapists and the BCBA or Clinical Supervisor. The instructors are delivering the therapy on a daily basis.  The Senior Therapist does the assessment and follows the programming to ensure that it is being properly executed and that the child is making progress. The BCBA works with the Senior Therapist to do the assessment and determine what the goals should be.  They will work together with the Senior Therapist to write the programs and train the instructors.