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Muizzudin Rifki Alhanif, MRA and Dewi Lengkana, Dewi Lengkana and M. Setiyarini, MS and kartini herlina, KH (2024) The Importance of E-Worksheet Based on Problem Based Learning Activity to Improving Student’s System Thinking Skills: Science Teacher’s Perspective. International Journal of Current Science Research and Review, 7 (5). ISSN 2581-8341