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CHAPTER 9: Single-Case Designs and Small-n Research 301FIGURE 9.4Multiple baselines showing percentage of football blocks executed correctly by four players as afunction of standard coaching and behavioral coaching. (From Allison & Ayllon, 1980.)Standard CoachingBehavioral Coaching50Jonaa250Percentage Blocks Executed Correctly502505025AlanStevea a a aaa050David250a2 4 6 8 10 12 14 16 18 20 22 24 26 28 30Sessionsa = absentestablish baselines showing the frequency of a child’s aggressive behavior athome, in the classroom, and at an after-school daycare facility. As with othervariations of this design, the treatment is applied at different times and thebehavioral records are examined to determine whether behavior changes systematicallywith the introduction of treatment.Hartl and Frost (1999) successfully treated a 53-year-old woman for compulsivehoarding. The clutter in her house took up approximately 70% of the livingspace such that rooms could not be used for their intended purpose. In the TVroom, for example, newspapers, paid and unpaid bills, letters, and other itemswere piled 3 feet high on the couch and spilled onto the floor, burying a coffeetable. In other rooms and hallways there were numerous gifts that the clienthad bought with no particular recipient in mind, the piles at time reaching theceiling. Treatment consisted of “training in decision-making and categorization,exposure and habituation to discarding, and cognitive restructuring . . . each