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Three elements of the ecology of a mathematics methodsfield experience were particularly important topromoting a shift in locus of authority thatprecipitated reflective thinking among the preserviceteachers: (a) an inquiry perspective, (b) the cohortgroup, and (c) school-university collaboration. Thearticle describes these three aspects of the ecologyof the field experience and provides the perspectivesof the mentor teacher, preservice teacher, and teachereducator. Also included are new challenges andproblems that arose with each aspect.