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What is the ABLLS?

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The ABLLS is the Assessment of Basic Language and Learning Skills. The ABLLS is an educational tool used frequently with ABA to measure the basic linguistic and functional skills of an individual with developmental delays or disabilities. The ABLLS was developed based on principles from B. F. Skinner's book Verbal Behavior. Verbal behavior states that language can be treated as a behavior like any other. Therefore, this behavior can be broken down into smaller and smaller components, which can be used to track deficits and strengths in a child's language or social abilities. The ABLLS was originally developed by Mark L. Sundberg, Ph.D., BCBA and published as the 1990 book "Teaching verbal behavior to the developmentally disabled". The assessment program was later rewritten with the help of James W. Partington, Ph.D., BCBA and published as the 1998 ABLLS. The new, ABLLS-R (revised), was updated by Dr. Partington alone.

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