FBAs involve both experimental and descriptive assessments of behavior functions. Experimental methods, also known as functional analyses (Iwata, et al., 1982/1994), have the advantage of using experimental manipulations and direct, continuous observations of behavior. The procedures outlined by Iwata, et al. (1982/1994) are considered the gold-standard for functional analyses. The procedure involves the use of multi-element, single-subject experimental design. During the functional analysis, consequences presented for a maladaptive behavior are varied. The experimental conditions outlined by Iwata, et al. (1982/1994) are labeled by the presumed function tested in a condition and include: escape/avoidance, attention, automatic reinforcement/self-stimulation, and control (i.e. preferred toys + social attention).