4.4. Procedure: All the teachers who had participated in the project-based learning program were invited to complete a questionnaire one or two weeks after their students had completed the projects. They completed the questionnaire either at home or school and returned it a week later in a sealed envelope to their school secretaries. This procedure was adopted to ensure that the teachers could complete the questionnaire at their convenience without the monitoring of school administrators. To ensure that the questionnaire was anonymous, the teachers were informed that their data would be reported collectively and used for research purposes only. In the returned questionnaires, 182 had complete data and were used for analyses in the present study. The attrition rate was 14%.