This research in general is aimed to develop student worksheet base on contextual approach on the coordination system for senior high school in grade 11 using metode of 4-D development. The subjects of this research is one of lecturer majoring in biology at Padang State University, two teachers of SMAN 3 Padang, and 30 students in grade 12 of SMAN 3 Padang as potential users of the product. Data that used in this research is primary data. Instrument of data collection in this research is a questionnaire of validity and practicalicity filled out by expert and students. The result for validity is 91,2% that criteria is very valid. Result for practicalicity from teacher is 90,5% that criteria is very practical and from stucent is 81,3% that criteria is practical.st
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