https://sej.umsida.ac.id/index.php/sej <p>Science Education Journal (SEJ) is a scientific journal that accommodates the result of study and literature review in the field of science education at primary, secondary, and higher education. SEJ published by Universitas Muhammadiyah Sidoarjo two times a year in May and November. This journal has been doing a collaboration with Perkumpulan Pendidik IPA Indonesia (PPII)/ Indonesian Society for Science Educators. SEJ is available in an online version. SEJ is already accredited <a href="http://sinta.ristekbrin.go.id/journals/detail?page=2&amp;id=1898">S3 by the Ministry of Research-Technology and Higher Education Republic of Indonesia</a> in 2017.</p> Universitas Muhammadiyah Sidoarjo en-US SEJ (Science Education Journal) 2540-9859 https://sej.umsida.ac.id/index.php/sej/article/view/1676 <p><em>The aim of this research is to (1) produce an Arduino Uno-based physics teaching aid product with the help of an infrared sensor on viscosity materials, (2) to test the feasibility of the developed teaching aid, (3) to determine the practicality of the developed teaching aid, (4) to find out responses from students regarding the teaching aids developed. The model used in this development is the 4D development model of Definition (Define), Planning (Design), Development (Development) and Dissemination (Dissemination). The feasibility test was carried out by two material expert lecturers and two media expert lecturers, the feasibility test carried out by two material expert lecturers received a percentage score of 98% in the "Very Eligible" category, and the feasibility test carried out by the media expert lecturer received a percentage score of 94 .17% with the category "Very feasible". Distribution was carried out to teachers to assess practicality and students to obtain responses from students regarding the teaching aids being developed. The practicality score carried out by two physics teachers received a practicality percentage score of 94% in the "Very Appropriate" category and for responses from students, the average response percentage score was 93% in the "Very Practical" category. So it can be concluded that the Arduino Uno-based teaching aids assisted by infrared sensors for viscosity materials are very feasible and practical to use during learning</em><em>.</em></p> Suprianto Fila Rofah El Indahnia Kamariyah Maimon Sumo Copyright (c) 2025 Suprianto, Fila Rofah, El Indahnia Kamariyah, Maimon Sumo https://creativecommons.org/licenses/by/4.0 2025-05-31 2025-05-31 9 1 209 229 10.21070/sej.v9i1.1676 https://sej.umsida.ac.id/index.php/sej/article/view/1695 <p>Diagnostic assessment plays a crucial role in the learning process, particularly in identifying students' prior knowledge and learning needs before instruction begins. This study aims to analyze the implementation of diagnostic assessment in the IPAS (Science and Social Studies) subject for fourth-grade elementary school students. A qualitative descriptive approach was used to examine how diagnostic assessments are conducted and their impact on student learning outcomes. Data were collected through classroom observations and student performance analysis. The results indicate that diagnostic assessments help teachers design more effective learning strategies tailored to students’ abilities. However, some teachers do not fully implement diagnostic assessments, leading to disparities in students’ understanding of the material. The findings emphasize the need for proper training and structured implementation of diagnostic assessments to enhance students’ critical thinking skills and improve overall learning outcomes.</p> Dwi Pangestuningtyas Nasution Nasution Ganes Gunansyah Neni Mariana Nurul Istiq' Faroh Copyright (c) 2025 Dwi Pangestuningtyas, Nasution Nasution, Ganes Gunansyah, Neni Mariana, Nurul Istiq' Faroh https://creativecommons.org/licenses/by/4.0 2025-05-31 2025-05-31 9 1 231 244 10.21070/sej.v9i1.1695