A parent comes to you to express her concern about her 10-ye…

A parent comes to you to express her concern about her 10-year-old daughter, Jackie, who is afraid of dogs and runs away whenever she sees one. You schedule a session with Jackie and her mother and arrange to have a well-behaved dog present. Although Jackie is highly fearful at first, you encourage her to remain in the office until her anxiety diminishes. You are employing a model of treatment based on