© 2016, Ankara University. All rights reserved.The purpose of this relevant research was to determine the perceptions that related to effects of the projects carried out by the secondary school students in their extracurricular exercises on their Science and Technology lesson’s achievement. The sample of the study consisted of seven students attending in a secondary school in Ankara. In this research, the qualitative research techniques were used to collect data. The semi-structured interviews were carried out with 5 students who participated in the project study. Furthermore, 7 students who constituted the research had been observed. Regarding the research study, they stated that the project study brought positive contribution on their Science and Technology lesson; it made them develop positive attitudes and provided them to make the connection with the other disciplines. It was among the other suggestions that these kinds of studies designed as an extracurricular exercises within the concept of the Science and Technology lesson and can also be used during the class activities effectively.