This study aims to (1) analyze the differences in understanding of physics concepts and science process skills among groups of students who study with contextual teaching and learning REACT model (MPKREACT) with a group of students who studied with conventional learning models (MPK). (2) Analyze the differences in understanding of physics concepts among groups of students who study with MPKREACT with a group of students who studied with MPK. (3) Analyze the differences in science process skills among groups of students who study with MPKREACT with a group of students who studied with MPK. The subjects were eighth grade students of SMP PGRI 9 Denpasar academic year 2012/2013. Sampling of the research was conducted by simple random sampling technique. Data were analyzed with descriptive statistics and MANOVA one lane. Based on the results of this study concluded that (1) there are differences in understanding of physics concepts and science process skills among the group of students who studied with MPKREACT with a group of students who studied with MPK (F=25,715; p<0,05). (2) There are differences in understanding of physics concepts among the group of students who studied with MPKREACT with a group of students who studied with MPK (F=47,844; p<0,05). (3) There are differences in science process skills among the group of students who studied with MPKREACT with a group of students who studied with MPK (F=8,795; p<0,05)