The report describes the operation of a model preservice special education teacher preparation practicum designed from a competency based teacher education frame of reference and utilizing a computer assisted teacher training system (CATTS). Chapter I provides introductory information (including teacher training objectives) and an explanation of practicum organization (with sections on such program components as physical setting, criteria for trainee and pupil selection, and accountability and assessment techniques). Chapter II focuses on the Oral Reading Observation System (OROS), a research and evaluation tool that enables a trained observer to code teacher and child verbal behaviors during an oral reading activity. Chapter III, which makes up a major portion of the document, presents five related studies of teacher behavior conducted in conjunction with the CATTS-OROS teacher preparation practicum. Addressed in each study are the subjects, procedures, background of the study, and training interventions, along with the specific treatment or empirical questions. Among the 18 sections of the appendix are sample training manuals, summary of responses to tutor evaluation, lesson plan checklist and form, bibliography of child-use materials, and tabulation of pupil responses to interviews. (SBH)