The development of learning models based on integrated STEM lower secondary education projects has not yet been carried out. The integration of STEM into education is necessary because the high demand for human resources in 21st century STEM mastery-based learning provides space for students to choose activities to be carried out during learning, it also presents great opportunities for teachers to observe activity in developing student abilities. Quantitatively, an integrated project-based STEM learning model can improve students' critical thinking skills in mathematics in junior high school.In this regard, this study aims to develop project-based teaching materials that present mathematical topics combined with other STEM field teachers. The research method used is research and development. In this study only carried out at the stage of testing the validity of teaching materials that have been developed. Data collected during the study are material content validity evaluation sheets, advance validity, and construct validity, as well as conclusions on the feasibility of teaching materials. The data obtained were tested using Q-Cochran. The results showed that the integrated Project-Based Learning STEM teaching materials had passed the pace of development, an examination by judicial experts, and expert media testing to validate teaching materials. The validation results show that the face validity and the content validity of the teaching materials are valid and feasible. Then the results of construct validity are included in the validity of very good to very good. Then the validity of each item on the evaluation shows the high validity of the dominant values. It can be concluded from this study that the teaching materials developed have high flexibility, the instructions contained in the teaching materials are easily understood by students, and are suitable for use in a limited scope.

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Pengembangan model project -based learning terintegrasi STEM di Sekolah Menengah Pertama belum banyak dilakukan. Padahal, integrasi STEM dalam pendidikan menjadi hal yang perlu untuk segera dilakukan mengingat tingginya kebutuhan akan SDM yang menguasai bidang STEM pada abad ke 21. Kebanyakan materi matematika disampaikan secara abstrak, sehingga mengakibatkan siswa tidak terlatih dalam mengembangkan kemampuan berpikir kritis matematis. Model pembelajaran yang dikembangkan ini memberi ruang kepada siswa untuk mengembangkan gagasannya dan mengaitkan dengan konsep dasar yang dimilikinya untuk menghasilkan produk sebagai proses untuk memahami konsep. Guru dapat mengembangkan aktivitas pembelajaran menjadi bermakna dengan keterlibatan siswa secara langsung dalam project. Penelitian ini bertujuan untuk mengembangkan suatu bahan ajar baru berbasis project  yang menyajikan topik matematika dipadukan dengan bidang STEM lainnya. Berdasarkan data yang diperoleh secara kualitatif, rancangan bahan ajar seringkali mengalami perubahan susunan penyampaian bergantung pada keberagaman kemampuan siswa dan pengetahuan guru. Secara kuantitatif, model project -based learning terintegrasi STEM, dapat meningkatkan kemampuan berpikir kritis matematis siswa SMP.

The development of mathematics’ teaching material using project-based learning integrated with science, engineering, and technology (STEM) is a new thing to do. In its development, teaching materials through two series, namely the preparation and development then validation of teaching materials that have been developed. This research was conducted to determine the validity value of mathematics teaching materials based on project integrated with STEM. The data of this study were obtained from the assessment of mathematicians who acted as material experts and media experts to determine the face validation, content validation, and construct validation. The validation by 36 junior high school students was conducted to find out the value of content validity in each part of evaluation to ensure the learning objectives could be achieved. The results of the experts judgement and 36 junior high school students can be concluded that the teaching materials being developed have a high value of face validation, content and constructs. Based on these results, mathematics teaching materials that are developed feasible and valid for use in a broad scope of research or furthermore are worthy of being used in the learning process of teaching mathematics on appropriate topics.