Method of using sampling in teaching experimental sciences

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On the use of sampling and qualitative case study approach; Brickhouse explored three science teachers' insights into the relationship between science and technology and the impact of such insights on classroom practice, and in 1990 tested a similar teacher relationship between understanding the nature of science and classroom practice. During the four months, a minimum of four hours of interviews and thirty-five hours of class observations (taped) were collected for each teacher. Additional data was also collected through tests, classroom exams, and training materials. Additional data was also collected through tests, classroom exams, and training materials. Two teachers, who were also experienced teachers, showed classroom exercises that were in line with their own vision and philosophy, while at first the classroom exercises were not in line with their beliefs. Institutional (formal) constraints have been expressed as barriers