in High School Science Education

The purpose of conducting this research was investigating the methods of effective use of experimental activities in science education. To do this, the available theoretical and research literature in the field was carefully studied. Furthermore, to achieve a suitable model, the various viewpoints were categorized and analyzed. then, the most applied elements of the theories were brought forward and combined into one model. This innovative model, based on problem solving activity, is in harmony with physics, chemistry and biology curriculum and High Schools facilities, and could be implemented in Iranian educational system. The research method here has been of descriptive- survey type. Data collection was done using a special questionare which was validated and adjusted according to Iran's conditions using available resources and doing interviews with experts (6 presons). The reliability of interviews was investigated and confirmed through the Cronbach Alpha method (α = 0.79). The research sample for accrediting the presented model included educational experts (120 persons in domain of physics, chemistry and biology), and curriculum planning epecialists (10 presons).In order to analyze the data, the descriptive (mean) and inferential (t- test) statistics were used. In general, the research results show that the recommended model has an important role in introducing of experimental activities in science education classes and educational experts and curriculum planning epecialists agree to a high level with it.