Chronological age is an obvious variable in making an appropriate placement. The research suggests that the earlier intervention is provided the better the potential outcome. Much of the outcome literature has been done with preschool aged children (e.g., Eikeseth et al. 2002; Lovaas 1987; Smith et al. 2000) or most recently, infants and toddlers (e.g., Rogers and Dawson 2010). Harris and Handleman (2000) found a correlation between early age at initial intervention and placement in a mainstream setting after preschool.