This week’s Seminar will focus on the use of measurement tools to assess client behavior. Your response to the questions above should be composed in complete sentences and paragraphs and be 300–350 words in length.

  1. What do the letters A, B, and C represent in single subject designs?

  2. What do the letters O, X, Y, and R represent in group research designs?

  3. What are threats to internal validity?

  4. Explain history and maturation as to how they can be a threat to internal validity.