The absence of teaching materials that can train students’ problem-solving skills optimally is the background of this research. This study describes the validity of simple harmonic motion electronic teaching materials based on authentic learning to train students’ problem-solving skills. This research is development research with the ASSURE model that focuses on the Utilization of Instructional Materials stage. The instrument used is the validity sheet of electronic teaching materials. The validity of electronic teaching materials is viewed from the aspect of content, construct, and appearance. The validation of electronic teaching materials is carried out by three validators: two expert validators and one practitioner validator. The data analysis technique used descriptive statistics. The results showed that the validity of electronic teaching materials with an average score of 3.87 was categorized as good. It was concluded that the simple harmonic motion electronic teaching material based on authentic learning was declared valid to train students’ problem-solving skills. Furthermore, these electronic teaching materials can be used as teaching materials in the classroom to determine the practicality and effectiveness of the developed teaching materials.

This research aims to decide the teacher's competencies in the use of media in the thematic learning of class V SD Negeri 31 West Pontianak. The sub-problem in this study is how is the teacher's method in the usage of media in the thematic learning of class V SD Negeri 31 West Pontianak? and What are the problems confronted via instructors in using media in the thematic learning of category V SD Negeri 31 West Pontianak?. While the technique used is descriptive. The supply of the facts in this learn about was once the fifth grade instructor at SD Negeri 31 West Pontianak. Data collection tools in this study were commentary and interviews. Data analysis in this lookup is using an interactive model with the ranges of statistics reduction, statistics display and the system of drawing conclusions. This lookup suggests (1) the teacher's strategy in the usage of the media and (2) the issues faced by means of the instructor in the use of the media.Keyword : Teacher Skills, Media, Thematic Learning