摘要：The aim of this study was to examine effectiveness of applying learning together (LT)
method at different intervals on improvement of middle school students' academic success and
science process skills. The sample of study was cconsist of 117 sixth and seventh grade students in
two puplic middle schools. In this study, the “Solomon Experimental Design” was used. In the first
year of the application was conducted with sixth grade students, and in the second year, a year
later, the same students who graduated to the seventh grade and an additional seventh grade class
who had not participated the year before were included in the study. The experimental groups were
applied the LT method and control groups were applied the existing method which the middle
school science curriculum followed in Turkey was taught. As data collection tools, Preliminary
Information Tests, Science Process Skills Tests and Academic Achievement Tests were used.
According to the findings, the Solomon Experimental Design, applied twice different intervals in
the same group of students, internal and external validity of the research was increased. In
conclusion, it was found that the two-time application of the LT in teaching a subject to the same
students group was more effective than the one-time.
关键词：learning together method; middle science education; science process skills; Solomon
experimental design
