A development and field-testing effort explored ways of helping preservice teachers learn classroom management knowledge and skills during field-based preservice courses. An observation guide, "Learning the Classroom Environment, An Observer's Guide to Classroom Management" (Sanford & Emmer, 1985), has four general areas: the classroom setting; classroom procedures and routines; managing student behavior; and organization of instructional activities. The guide was used during one semester at four different institutions in different kinds of preservice training experiences. Samples of students' work and feedback from course instructors and students were analyzed to assess the usefulness of the approach, explore different ways the guide can be used in conjunction with other course activities, and plan future development or revision steps. The study results indicated that activities described in the guide were effective in helping students learn about classroom management. Descriptions are given of the use of the guide at each school. (CB)