In the first several decades of ADHD treatment research, there was little focus on developmental level. For example, in the series of four evidence-based treatment reviews for youth with ADHD that began in 1998 (Evans, Owens, & Bunford, 2014; Pelham & Fabiano, 2008; Pelham et al., 1998), it was not until the most recent version that levels of evidence were differentiated based on ages of participants (Evans et al., 2018). Indeed, all of the issues addressed previously in the discussion of mechanisms of change are not static, as mechanisms are likely to change across development. Thus, it is critical to identify relevant mechanisms at each stage of development. However, even if the mechanism remains the same across development, treatment outcomes may also differ as a function of development. For example, one developmental issue is that effect sizes of behavioral interventions may diminish as children age into adolescence (Sanders, Kirby, Tellegen, & Day, 2014). Although it is unlikely that behavioral principles become less relevant as children age, it is possible that the ability of an adult to adequately manage the complexities of reinforcement and punishment that operate in the life of a 15-year-old adolescent is far less than an adult’s ability to manage these in the life of a 5-year-old.
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