<![CDATA[Dynamic electricity is important due to its function as a thinking tool for further electronic circuit analysis. It is an abstract concept that must be understood by students as well as by physics teachers. A study about developing a set of two-tier multiple-choice questions was conducted to measure the system thinking skill of a number of student-teachers using Design Development Research (DDR). The instrument has been tested for its validity through expert judgment and field testing on a number of student teachers (n=62). After studying dynamic electricity learning material that had been prepared before. Based on the r table, which is 0.2108, it was obtained that out of 25 two-level tests, 23 were valid and can be used to measure students' and teachers' systems-thinking skills. In addition, the instrument showed high reliability, with a Cronbach’s alpha coefficient of 0.840.]]>
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