Özet:

This study aims to describe the effectiveness of student worksheets based on discovery learning combined with assessment for learning higher order thinking skills  in fostering high-level thinking skills of students especially in human circulatory system material. True experimental research design is a type of pretest-posttest control group with subjects consisting of two groups of eighth grade students of junior high school taken by random sampling. The research instrument in the form of student worksheets based on discovery learning combined with assessment for learning higher order thinking skills results of development with the feasibility of having guaranteed expert team validation and limited trials. Data collection research was conducted using observation sheets of high-level thinking skills and higher order thinking skills oriented cognitive test questions.  The research data were analyzed descriptively qualitatively and quantitatively using t test. The results of data analysis showed the results of observations student behavior in the experimental class 1 and experimental class 2 which corresponded to the indicators of high-level thinking skills categorized as "very high" that is 80,83% analyzing, evaluating 81,90% and creating 82,33% while the results of the analysis response data of students' answers to higher order thinking skills cognitive test questions using the t test obtained sig (2-tailed < 0,05), namely sig (2-tailed) = 0,000.  Thus the student worksheets based on discovery learning combined with assessment for learning higher order thinking skills in learning specifically on human circulatory system material is declared to be effective in fostering students' high-level thinking skills.

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