“…Procedures used to examine the degree to which access to various stimuli displace problem behavior, relative to a nostimulus control condition, have recently been termed competing stimulus assessments (DeLeon, Rodriguez-Catter, Fisher, Delia, & Marhefka, 2000;Fisher, DeLeon, Rodriguez-Catter, & Keeney, 2004;Long, Hagopian, DeLeon, Marhefka, & Resau, in press). Several studies have demonstrated that noncontingent access to competing stimuli can effectively reduce problem behavior maintained by automatic reinforcement (Piazza, Fisher, Hanley, Hilker, & Derby, 1996;Ringdahl, Vollmer, Marcus, & Roane, 1997;Roane, Vollmer, Ringdahl, & Marcus, 1998;Shore, Iwata, DeLeon, Kahng, & Smith, 1997;Zhou, Goff, & Iwata, 2000).…”