<![CDATA[Purpose: to develop an e-module based on STEM Project-Based Learning, integrated with local wisdom, for valid, practical, and effective mathematical reasoning. Design/methodology/approach: The study uses the Richey and Klein development design and the Dick and Carey model. The development design includes analysis, design, development, and evaluation. The study involved grade XII students of SMK PGRI Singosari in the 2025/2026 academic year. The research instruments included validation sheets, response questionnaire sheets, and reasoning test questions. Data analysis was used to determine the validity of the e-module to determine whether the e-module preparation had met the validity criteria, which included material, learning, and e-module product design. Furthermore, the practicality of the e-module was determined by using a response questionnaire. The effectiveness of the e-module was determined by whether the e-module was effective in learning using a mathematical reasoning test. Findings: The e-module on STEM Project-Based Learning integrated with local wisdom in mathematical reasoning can be declared valid, practical, and effective. Practical implications: STEM-based project-based learning modules integrated with local wisdom in mathematical reasoning can be used in mathematics learning. Originality/value: This research develops a synergy between STEM and project-based learning syntax and integrates local wisdom to foster students' mathematical reasoning. Â Purpose: mengembangkan e-modul berbasis STEM Project Based Learning terintegrasi kearifan lokal dalam penalaran matematis yang valid, praktis dan efektif. Design/methodology/approach: penelitian menggunakan desain pengembangan Richey dan Klein dengan model Dick dan Carey. Desain pengembangan meliputi: analysis, design, development, dan evaluation. Penelitian melibatkan siswa kelas XII SMK PGRI Singosari pada tahun akademik 2025/2026. Instrumen penelitian meliputi lembar validasi, lembar angket respon, dan soal tes penalaran. Analisis data yaitu kevalidan e-modul, untuk mengetahui penyusunan e-modul telah memenuhi kriteria kevalidan yang meliputi materi, pembelajaran dan desain produk e-modul. Selanjutnya kepraktisan e- modul untuk mengetahui e-modul parktis dengan menggunakan angket respon. Keefektifan e-modul untuk mengetahui e-modul efektif dalam pembelajaran dengan menggunakan tes penalaran matematis. Findings: e-modul berbasis STEM Project Based Learning terintegrasi kearifan lokal dalam penalaran matematis dapat dinyatakan valid, praktis dan efektif. Practical implications: -modul berbasis STEM Project Based Learning terintegrasi kearifan lokal dalam penalaran matematis dapat digunakan pada pembelajaran matematika. Originality/value: penelitian yang mengembangkan dengan mensinergikan sintaks STEM dan Project Based Learning serta mengintegrasikan kearifan lokal sehingga dapat menumbuhkembangkan penalaran matematis siswa.]]>
