The existence of basic competence skills in the current national curriculum requires learners to have skilled expertise in the field of physics, which one of them is students" science process skills. Students' science process skills become students" guide in understanding physics concepts. The availability of resources and guidance in conducting practicum is very small, so teachers have difficulties when they want to conduct practicum in learning activities because of the lack of resources available. Therefore, we need a scientifically based practicum module to increase students" science process skills. This development research using 4-D method (Define, Design, Develop, and Disseminate). In the development of this module, the researchers only come to the third stage of the four stages. Validation results from experts get an average score of 81% interpretation which means that the module is included in the criteria worthy of use in learning even with the notes of experts to revise some of the components present in this module so that this module complies with existing standards. The results of the analysis of student responses to the practicum module obtained a total average of 80% with the category is "strong." This shows almost all the students gave a positive response to the scientific-based practicum module. The development of scientific-based practicum modules can improve science process skills of the students, with the average score of students" science process skills before using a scientific-based practicum module of 2.54 and the average score of students" science process skills after using a scientific-based practicum module of 3.20.

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This research aims at developing a module for teaching Physics in high school. The research employs Research and Development (R&D) method with ADDIE model (Analyze, Design, Develop, Implement, and Evaluation). The research ends up on the Implement stage where the researchers only validate the module to the expert for it does not require the students’ responses. The module developed by researchers is Physics Practical Module Based on Scientific Method for the Tenth Grade High School Students in the Second Semester. Validation process is based on validation from the material expert, the design expert and the language expert. The validation uses Likert scale from 1 to 5, with the scale 1 of very low to 5 of very good grades. The average validation results of the three main aspects of material or content, design and language are 4.10 or 82% and is categorized as “good” category. Thus, it can be concluded that the Physics Practical Module Based on Scientific Method for the Tenth Grade High School students in the Second Semester is appropriately to be used.