METHODOLOGY
PARTICIPANTS
In April, 2012, all the male first graders in high schools in Arsanjan, Iran, were invited
to participate in this study. 44 students volunteered to participate in this study and after the
final exams, they gathered in Parto Institute, Arsanjan, to be told about the details of the
study. In the first session, they were assigned to two groups (experimental and control)
through simple random sampling and they were told that they were going to be taught some
parts of their following year chemistry textbook during 15 sessions. The researchers
answered all the questions the students asked about the project. At the end of the session,