Development of meaningful investigation laboratory (mil) learning model to improve critical thinking skills in physics earning

Learning models must be innovative in 21^st century. One important component in the 21^st century is critical thinking skills. Learning models require innovation, not only in the classroom. The Meaningful Investigation Laboratory (MIL) learning model is the solution for the based laboratory learning model that can improve the ability of critical thinking skills. The research method is research and development Nieveen's Design. The results validation of MIL learning models and validation learning instruments is 92,5% and categorized as valid. There is an increase critical thinking skills after using the MIL learning model. This result is post-test higher than pretest with an N-gain value is 0.76 and categorized as high criteria. Students responses use MIL learning model is 84,52% positive responses and categorized very good. The critical thinking skills in the MIL learning model is found in every learning syntax. Critical thinking skills can be developed from: 1) Critical questions in precondition syntax, 2) Scientific experiment with critical thinking student workshhet in investigation syntax, 3) Reporting the results of investigations in critical class discussions in report syntax, 4) Reinforcement quiz are critical questions and analytical problems in the reinforcement syntax, and 5) Critical reflection from teacher to students and make conclusions together in reflection syntax.