This study investigated the factors underlying the estimation of learner self-confidence during explanations with a conversational agent in an online explanation task. Based on reviews of previous studies, we focused on how factors such as the learner's task activities and personal characteristics can be predictors. To examine these points, we…

Ten children and adolescents with severe mental retardation were assigned in matched pairs to either a lexigram augmentative communication condition (graphic symbols) or a control condition (social stimulation). The three subjects who successfully acquired lexigrams also exhibited changes in attention, intentional communication, and sociability.…

Three papers comment on a paper by Abrahamsen et al (EC 212 728) on concomitants of success in acquiring an augmentative communication system (AAC) by persons with severe mental retardation. Comments focus on design and methodological requirements, principles of AAC, and sequence and process in indirect aspects of communicative gains. (DB)