Abstract
The current reality shows that the media used is still conventional and unable to improve critical thinking skills. Research to see the validity, practicality, and effectiveness of learning media. This research method uses Plomp and Nieveen which are limited to the prototyping phase, formative evaluation based on Tessmer which consists of self-evaluation, expert opinion, individual testing, small group testing, and field testing. The research subjects consisted of 3 experts and 30 students who had programmed the Invertebrates course for individual tests, small group tests and field tests. Data collection techniques were carried out by observation, questionnaires and tests. The results showed: the validation of the android media has shown that the media is feasible to use, the practicality test shows the ease of the learning process, the effectiveness test of using android media has an impact on the learning process and improving critical thinking skills. This shows that the developed android media can be used, then this research can be developed further by expanding its use.
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