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Technological Content Knowledge (TCK) is an integration of technology in a learning that based on the material that is being taught. The aim of this research is to develop observation instrument for measuring how the application of TCK of biology in Senior High School during the class. The type of this research is Design and Development Research (D&amp;DR) that based on the development model of Peffers with the steps: 1) problem identification, 2) describe the objectives, 3) design and develop the artifact, 4) test the artifact, 5) evaluate testing result, 6) communicate the testing result. Instrument validity involved judgment from expert while empirical validity was analyzed by using biserial correlation. Instrument reliability uses inter-rater reliability and analyzed by using interclass correlation coefficient (ICC). Result of empirical validity shows that from 12 TCK evaluation items, two of them are not valid. While for the reliability, instruments that have been made are reliable with the ICC as much as 0.921.

Developing Instrument to Evaluate the Technological Content Knowledge (TCK) Application of Biology’s Teacher