Improving grade xi students' learning outcomes in sensory system through discovery learning

The sensory system is a sub-chapter of the Coordination System which is difficult to understand if you only study orally. For this reason, a learning model and teaching and learning activities are needed to support the improvement of learning outcomes. Classroom Action Research (PTK) with the spiral model from Kemmis and Mc Taggart using 2 cycles with each cycle consisting of 2 meetings is one of the solutions to overcoming class problems. The increasing result of learning outcomes was analyzed by evaluating the effectiveness of the N - Gain formula. The research subjects were students of class XI MIPA 3 at SMAN 1 Ampel, Centra Java. learning outcomes in each cycle have increased with the results in cycle 1 was 0.79 and cycle 2 was 0.75. The discovery learning model and experiments with the simple practical can improve student learning outcomes, in cycle 1 from 53 to 90, and in cycle 2 from 48 to 87. The use of the discovery learning model toward student learning outcomes runs effectively with the significance category of N – Gain values from each cycle in the high category