22 (2), 2021, 270-278 Jurnal Pendidikan MIPA e-ISSN: 2550-1313 | p-ISSN: 2087-9849 http://jurnal.fkip.unila.ac.id/index.php/jpmipa/ Ronal Watrianthos et al. Email: ronal.watrianthos@gmail.com DOI: http://dx.doi.org/10.23960/jpmipa/v22i2.pp270-278 Received: 19 November 2021 Accepted: 23 December 2021 Effectiveness Blended Learning During Pandemic in Indonesia: A Meta-Analysis Ronal Watrianthos 1,* , Rosmidah Hasibuan 2 , Dheo Rimbano 3 , Nizwardi Jalinus 4 , Rijal Abdullah 4 1 Department of Computer Engineering, Universitas Al Washliyah, Indonesia 2 Department of Biology Education, Universitas Labuhanbatu, Indonesia 3 Department of Management, Universitas Bina Insan, Indonesia 4 Department of Technology and Vocational Education, Universitas Negeri Padang, Indonesia Abstract: The current blended learning method, which mixes online and traditional classroom instruction, is appropriate for the epidemic. According to various research studies, blended learning benefits students by allowing them to study independently without regard for location or time constraints. This article explores and describes the use of the blended learning paradigm during a pandemic using a meta-analysis technique. The objective is to determine the effect of blended learning on learning outcomes; according to the conclusions of a research released in 2021 based on ten published articles, employing the blended learning approach greatly improved learning outcomes during the pandemic, with an effect size value of 1.21. However, the outcomes of this study suggest that publication bias exists as a result of an unbalanced distribution of effect sizes. Keywords: blended learning, pandemic, meta-analysis Abstrak: Metode blended learning saat ini menjadi metode yang paling sesuai dimasa pandemic dengan menggabungkan pembelajaran online dengan metode kelas berbasis tradisional. Beberapa studi literatur menyatakan blended learning memberikan keuntungan bagi siswa untuk dapat belajar secara fleksibel, bebas, tanpa terhalang ruang dan waktu. Penelitian ini mengkaji dan memberikan penjelasan mengenai penerapan model blended learning di masa pandemic dengan metode meta-analisis. Tujuannya adalah mengetahui pengaruh Blended Learning terhadap hasil belajar. Hasil study pada sepuluh artikel yang diteliti yang terbit pada 2021 menyatakan penerapan model blended learning di masa pandemic memberi pengaruh yang tinggi terhadap hasil belajar dengan nilai efek size sebesar 1.21. Namun hasil penelitian ini memperlihatkan indikasi terjadinya publikasi bias karena distribusi efek size yang tidak simetris. Kata kunci: blended learning, pandemic, meta analisis. ▪ INTRODUCTION The epidemic has prompted Indonesia's educational system to speed its transformation to meet the demands of the digital era. The Internet has developed into a great source of knowledge and a viable alternative method of education. In times of pandemics, the Internet motivates students, makes teaching more interesting, and promotes critical lessons to be distinctive (Firman Edi et al., 2021). Throughout the epidemic, educators worked diligently to adapt to new teaching techniques to reduce the losses. During the Covid-19 epidemic, educators also become learners and jointly adjust to online teaching and learning (Samsir et al., 2021). By integrating online and conventional classroom-based instruction, blended learning is the proper way during pandemic times (face-to-face learning). It necessitates the actual presence of teachers and students and some student control over time, location,