“…Minimizing the number of response topographies in the contingency class (e.g., Thompson et al, 1998) or graphing response topographies separately (Derby et al, 1994(Derby et al, , 2000 may also yield clear assessment outcomes. When functional analyses based on brief session duration (5 to 15 min) yield undifferentiated results, observing the effects of contingencies over longer periods (hours, days, or weeks) may allow relevant EOs to operate for a sufficient amount of time to evoke problem behavior and yield clear assessment results (e.g., Arndorfer et al, 1994;Reese, 1997). Finally, arranging contingencies to follow reported precursors to the target responses or even arbitrary responses (see , Grace, Thompson, & Fisher, 1996 may demonstrate behavioral sensitivity to particular forms of reinforcement that can then be incorporated into treatments for problem behavior (this strategy may be an improvement over arbitrarily selecting an intervention, but it does not determine the actual function of problem behavior).…”