This publication summarizes the proceedings of a Montessori colloquium on adolescence, designed for trainers and practitioners to find common ground between the theory of Erdkinder (observing children and, accordingly, creating a suitable environment) and practice as seen in current Montessori secondary programs. Opening remarks on the need for a common vision were made by Renilde Montessori. The paper topics were: (1) adolescents' educational needs (John Long); (2) spiritual development and healthy environments for adolescents (Pat Ludick); (3) adolescents' need for challenge, changing relationships with teachers, and responsibility (Larry Schaefer); (4) Conscious Cosmic Education (John McNamara); (5) program implementation (Linda Davis); (6) the need to meet the goals of Cosmic Education before starting a real Erdkinder (Margaret Stephenson); (7) a proposed course of action leading to the establishment of an experimental Erdkinder program (Camillo Grazzini); (8) personal perspective on the third plane (Kay Baker); and (9) the need for a model and training for adolescent programs (Peter Gebhardt-Seele). Questions regarding each paper and a general discussion are summarized. Erdkinder was established by the group as a worthy goal but there was divergence of opinion as to how quickly an Erdkinder model could be implemented. (KB)