“…Most studies focused on establishing a verbal repertoire have been conducted with children (e.g., Charlop, Schreibman, & Thibodeau, 1985;Greer, Yaun, & Gautreaux, 2005;Partington & Bailey, 1993;Partington, Sundberg, Newhouse, & Spengler, 1994;Yamamoto & Mochizuki, 1988). Here, treatment programs based on behavior analysis have shown to be very effective (for a review of establishing verbal repertoires see O'Neill, 1990). Concerning the age of participants, there are some exceptions, one of them a study by Green, Linsk, and Pinkston (1986) on elderly participants in which positive verbal responses were reinforced and undesired verbal responses were ignored.…”