The Development of Guided Inquiry-Based Worksheet for Laboratory Work on Topic of Colloidal System for Senior High School Instruction

Research and Development (R&D) study was done to create aninstructional material on topic of colloidal system for senior high school students. The main goal was to produce a valid and practical guided inquiry-based worksheet for laboratory work for senior high schoolinstruction. The research used 4- D models,a model that comprises four stages including: (1) defining, (2) designing, (3) developing, and (4) disseminating. This research was performed until developing stage in SMAN 14 Padang. Kappa formula was used to examine validity and practicality of the product. Worksheetwasvalid in terms of content, language, graphics, and construct. Mean score of kappa moment for validity was 0.84. The mean score for practicality was 0.80 (for teachers) and 0.93 (for students). Analysis showed that 88% students completed the worksheet appropriately. Onaverage, worksheet for experimental work on colloidal system topic produced had high degree of validity and practicality.