The relative proficiency index (RPI), formerly called the RMI (relative mastery index) on the WJ-R, is a valuable score in better understanding a subject's quality of performance relative to peers in the normative sample. The score reads like the index used with Snellen charts to describe visual acuity. A 90 is always written in the denominator. An RPI score of 90/90 means that the subject demonstrated 90% proficiency on tasks where the average person in the comparison group (same age or grade) would also obtain 90%. The Developmental Zone (called the Instructional Zone on the WJ III ACH), is a special application of the RPI provided to help understand the subject's range of functioning on tasks from "easy" (independent level) to "difficult" (frustration level). The Developmental and Instructional Zone profiles are printed when using the Compuscore and Profiles Program.
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Whenever a doctor informs the parents that their child is suffering with Autism, the first & foremost question that is thrown over him is - How did it happen? How did my child get this disease? Well, there is no definite answer to what are the exact causes of Autism.