“…This far exceeds the 45,400 matches for positive reinforcement, although it is still lags behind the 231,000 for applied behavior analysis, the 488,000 for behavior analysis, and the 489,000 for behavior support. The professional market is being supplied with large numbers of books, manuals, CD ROMS, and on-line training options (e.g., Desrochers, 1998;Janney & Snell, 2000;. In the aggregate, these materials will have a considerable impact on the way that functional assessment is understood and, eventually, on the way that it is conducted.…”