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The performance assessment of the outcomes of a high school must use a valid and reliableassessment instrument. The instrument model for an outcomes performance assessment thatis built from the transformation of the National Education Standards to the Four BalancedScorecards perspectives produce 65 assessment items that are valid and have high reliability. High school outcomes performance assessment in North Sumatra can be done by using aformulated model of an outcomes performance assessment instrument so that the hope is thatthe quality of SMA can be improved.