contributed positively to students’ learning. It can also be said that the 2005 Science and Technology curriculum contributed positively to students’ learning. However, considering post-test academic achievement scores of the students in the experimental group were higher than those of the students in the control group, it can be said that project-based learning is more effective in increasing achievement than the 2005 Science and Technology curriculum. The project-based learning enables students to construct their knowledge. Therefore, it is thought that seminars regarding practice examples in Science and Technology courses, characteristics of project-based learning for teachers as well as training of prospective teachers, which can be taught in the Special Instruction Methods – I course, will make a positive contribution to the learning process. It is also thought that research on determining the effects of project-based learning in science and technology instruction on dependent variables can be conducted at different levels of education. Quantitative data were collected in the present study. It may be beneficial to collect qualitative data in future studies.