Improving the Quality of Learning through Lesson Study in STEM-based Mathematics Learning in Elementary School
The implementation of the MEA in Indonesia does not only affect the economic sector. The world of education has an important role in welcoming MEA. There are 4 skills that students must have in welcoming MEA, namely 21st century 4C skills consisting of Creativity (creativity), Critical Thinking (Critical Thinking), Communication (Communication) and Collaboration (Collaboration). The learning problems faced in learning in elementary schools are that students are not ready to take part in learning so that teachers use a lot of time to provide concepts with the lecture method. This condition has an impact on students' lack of creativity in the material being taught, in the end most of the students face difficulties in doing assignments, exercises, especially thematic material. Currently, there is an approach that is believed to be able to improve students' 4C skills, namely the STEM (Science, Technology, Engineering and Mathematics) approach. STEM is a multidisciplinary approach in which students learn science, technology, engineering and mathematics in one thematic lesson. The strategy used is Lesson Study. Implementation of Lesson Study aims to improve the quality of collaborative learning for elementary school teachers. Implementation of Lesson Study involves four teachers, one teacher as a model and the other teacher as an observer. Lesson Study activities include three stages of activities which are a series called a cycle, namely Plan, Do, and See. In the Plan stage, discussions are held to review the STEM learning planning (RPP) facilitated by the lecturer, in the Do stage learning is carried out by the model teacher based on the Plan's RPP results, in the See stage a reflection is carried out to examine the implementation of learning that has been carried out by the model teacher to be followed up on the next lesson. . The conclusion is that the implementation of Lesson Study can improve the understanding of the material through STEM learning by students and the class becomes more interactive than before.