This qualitative research study examined the teacher-student and student-student interactions that took place in two elementary parochial classrooms staffed by teachers nominated as effective by their supervisors. The study also examined relationships, similarities and differences between the teacher-student and student-student interactions. Qualitative data were collected including classroom observations, interviews with teachers, and focus group interviews with students. Results indicated that effective teachers supported their students organizationally through well-organized learning environments; instructionally by using a variety of instructional scaffolds, strategies and materials while holding students accountable for their learning; and emotionally by meeting students' needs for belonging and safety. Student-student instructional and emotional supports reflected most of the elements of teacher-student organizational, instructional and emotional supports but also included some negative interactions not present in teacher-student interactions. Implications for classroom practice, public policy and further research in classroom interactions are given. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]