This research has purpose to describe Students science process skills by using hypothesis deductive learning cycle in learning buffer solutions. This research method was descriptive with the subjects were 40 second class Senior High School in Bandung. The students were categorized into high, medium, and low categories. Instruments of this research were student worksheets, observation sheets and interview. Based on this research, the students able to develop 10 indicators science process skills which. They are observing, classifying, planning experiments, questioning, hypothesizing, predicting, using tools and materials, interpreting, applying of concepts, and communicating. The results show that students in high category, medium category, and low category are able to develop 10 indicator.

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This research aims to develop a valid, practical, and compelling multimedia interactive learning of water cycle material to improve student learning outcomes. The type of research used is development research by Borg and Gall, which researchers limit to 7 steps due to the Covid-19 pandemic. The research subjects used eight students of class V UPT SDN 191. The data obtained were analyzed descriptively quantitatively in validation results, user response questionnaires, and Posttest-Pretest results. Validity was obtained based on media and material validation results with a percentage of 89.58% and 87.5% (very valid). The practicality of the media was obtained based on the results of student and teacher questionnaire responses with percentages of 98.75% and 100% (efficient). While the effectiveness is obtained based on the average pretest score of 78 and posttest score of 85, it can be seen that the average value of posttest> Pretest with the percentage of complete learning outcomes is 87.5%. It can be concluded that interactive multimedia learning of water cycle material is very valid, practical, and effective in science learning of water cycle material.