The measurement of critical thinking skills of students on elasticity and Hooke Law topics

This study aims to develop test instrument to measure critical thinking skills. The research respondent were 32 students senior high schools. The research method used is Research and Development (R&D). Researching using Mc Intire Development model. The result of the instrument validations showed 0.86-0.90 for V Aiken of material expert. Based on the result of the validation of material expert, this instrument test was valid. Based on the reliability, this instrument test was proper with Alpha Cronbach scores 0.86. This separation toward person with score H=3,46 and item reliability score 0.95 with separation value score H=6.21. Difficulty level value -2.23 until 2.90. The most difficult item was number 3. This instrument adequate of dimensionality with raw variance data 63.4% with expectation 63.9%. The respondent 02P was the most consistent in answered the test.