Practicality of Performance Assessment Instruments in Measurement Topic 10^th Grade Secondary School

One of the competencies in Curriculum 2013 is having the skills to apply knowledge in doing scientific inquiry, while the skills are divided into two kinds: concrete and Achievement of these competencies can be determined by assessment. The information of student's ability given by authentic assessment is believed to be more holistic and valid, one of them is performance assessment. It is conducted to assess how appropriate the students in completing their tasks in the form of action or deed. The aim of this research is to obtain a description of the practicality and percentage of agreement of performance assessment instruments on measurement topic for 10^th grade secondary school. This research subject of trial as many as 19 students in 10^th science class at SMA Muhammadiyah 2 Surabaya with trial design one group pre-test post-test. Data are collected by using observation and direct questionnaire methods. The results showed that the practicality of the instrument based on the implementation of the assessment and the results of student responses fulfills the practical criteria and agreement between observers on the implementation of product performance assessment and process performance assessment are well categorised.