Unfortunately, only a few published investiga- tions that included aided AAC modeling used controlled, experimental research designs (i.e., Harris & Reichle, 2004; Johnston, McDonnell, Nelson, & Magnavito, 2003; Johnston, Nelson, Evans, & Palazolo, 2003; Kent-Walsh, 2003). All but one of these studies utilized aided AAC modeling as one component of a larger interven- tion program that included the use of additional facilitative techniques (e.g., providing adequate time to communicate, asking open-ended ques- tions); to date, only Harris and Reichle (2004) have isolated the impact of using aided AAC models on expressive communication. This type of systematic research, however, is critical to accurately deter- mining the key components of AAC interventions. Furthermore, the general trend within the AAC literature has been to focus on improving prag- matic skills, such as improving turn-taking (e.g., Kent-Walsh, 2003), and semantic skills, such as increasing expressive and/or receptive vocabulary (e.g., Harris & Reichle, 2004); no studies have investigated the impact aided AAC modeling has on interventions that target more developmentally advanced communication skills.