From a curriculum perspective, technology has two meanings; as a tool and as a system. Technology as a tool supports the learning process, and technology as a system is related to the curriculum planning stage. Both curriculum planning and technology are objectives. Appropriate technology in every learning or training during the COVID-19 pandemic is expected to apply effectively and efficiently. The expected situation does not work as well as it should be. Therefore, this study investigates the

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... effectiveness of using Android-based TennBasTech application technology to teach tennis with a scientific approach to young athletes aged 10 to 11 years. This study used an experimental method with a pretest-posttest-one-group design to test TennBasTech application in the scientific approach to teach tennis. The instrument used is the service accuracy test, the Groundstroke Forehand test and the Backhand drive test. The sample consisted of 35 participants of both male and female students. As a result, applying a scientific approach using the TennBasTech Android-based application contributes significantly in supporting young athletes to learn tennis at home. It is due to participants' interest in using some of the features in the application to help participants learn every movement well repeatedly. The limitation in this study lies in the form of evaluation that must be carried out by students not yet listed in the application. So for the following application development, research must include an evaluation model to make it easier for students to control their abilities.