This study investigated the extent to which persons developed their listening skills in an Indiana Plan Institute (a five day program in which participants meet in learning groups to study and use basic educational principles relevant to the formation and functioning of effective adult learning teams) when a listening skills workshop was added. Literature on the origins, early development, characteristics, desired skill outcomes, and operational effects of the Indiana Plan Institute and programs of listening training, was evaluated. An experimental and a control group (with or without the listening workshop) were chosen from participants in the 1969 Institute at Indiana University. Subjects were pretested and posttested on the Appraisal of Personal Growth in Teamwork (Revised) and the Brown-Carlsen Listening Comprehension Test. These were some major findings and conclusions: the two groups did not differ significantly in teamwork or listening skills on either the pretests or the posttests; both groups showed significant growth in teamwork skills; neither group showed significant gains in listening skills; and although a questionnaire on listening attitudes indicated that participants felt the effective listening workshop had improved their listening skills, other data did not support this view. (LY)