Oleh: Dhaniel Librianto
The low quality of education in Indonesia required serious efforts to control because it can lead to low competitiveness of Indonesia compared to the international community. Group Investigation model using guided inquiry strategy is expected to be an alternative to improve the quality of education, because it is potential to increased the students activity and learning achivement. This study aims to determine the effect of group investigation model using guided inquiry strategies on activity and student learning achivement. This study was quasi- experimental research with pre-test and post-test non equivalent design. Samples were divided into two treatment groups, named the control class using the conventional learning model and experimental class with group investigation model using guided inquiry strategies. The study was conducted as two meetings in each class and then the data were analyzed using analysis of covariance (Ancova) for learning achivement and t -test analysis for the learning activities in the treatment class. From the Ancova analysis, the results obtained a significant effect (Sig 0.03) on student learning achivement and the t -test analysis showed a significant differences (Sig 0.00) on the students' learning activities. From this experiment, it can be concluded that the group investigation model using guided inquiry strategies had an influence on the activity and student learning achivement.