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Design and development research combines qualitative and quantitative methods, including lecturer and student interviews and expert validation. 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\nDevelopment and validation of my online teaching with GeoGebra (MyOT_G+) kit on mathematical reasoning among pre-university students  \nRaihan Zainudin 1  \n 0009-0002-8015-671X  \nHutkemri Zulnaidi 2*  \n 0000-0002-7799-1223  \nNofouz Mafarja 2  \n 0000-0001-7367-3431  \nMohd Zahurin Mohamed Kamali 3  \n 0000-0002-9356-8900  \n1 Center for Foundation Studies in Science, Universiti Malaya, Kuala Lumpur, MALAYSIA  \n2 Department of Mathematics and Science Education, Faculty of Education, Universiti Malaya, Kuala Lumpur, MALAYSIA  \n3 Institute of Mathematical Sciences, Faculty of Science, Universiti Malaya, Kuala Lumpur, MALAYSIA  \n* Corresponding author: [hutkemri@um.edu. my](hutkemri@um.edu. my)  \nCitation: Zainudin, R., Zulnaidi, H., Mafarja, N., & Mohamed Kamali, M. Z. (2025) . Development and validation of my online teaching with GeoGebra (MyOT_G+) kit on mathematical reasoning among pre-university students. Contemporary Educational Technology, 17(2), ep569. [https://doi.org/10.30935/cedtech/15989](https://doi.org/10.30935/cedtech/15989)  \nARTICLE INFO ABSTRACT  \n\n| Received: 22 Sep 2024\u003Cbr>Accepted: 18 Jan 2025\u003Cbr>INTRODUCTION | Traditional rote learning methods often fail to adequately develop reasoning skills in mathematics, particularly among pre-university students. This study addresses challenges in fostering mathematical reasoning abilities, as evidenced by declining TIMSS results and resistance to pedagogical innovations. My online teaching with GeoGebra (MyOT_G+) kit was developed as a technology-enhanced teaching solution to improve students’ understanding of propositional logic. Grounded in constructivist theory, the kit integrates GeoGebra software and Venn diagrams for an interactive learning experience, focusing on subtopics such as De Morgan’s laws, conditional, converse, inverse, contrapositive, and biconditional statements. Using the design and development research approach and the ADDIE model, the study combined qualitative and quantitative methods. Phase 1 involved interviews with five mathematics lecturers and five pre-university students in Kuala Lumpur to identify instructional needs. Phase 2 focused on designing and validating the MyOT_G+ kit with input from 13 experts. Findings revealed the kit’s user-friendliness, adaptability, and ability to reduce cognitive load, facilitating a deeper understanding of mathematical concepts. This study highlights the potential of integrating technology into mathematics education, offering scalable solutions for improving reasoning skills in pre-university contexts. The MyOT_G+ kit provides evidence that interactive, visual tools enhance comprehension of complex topics, with implications for pre-university education and teacher training programs.\u003Cbr>Keywords: online teaching, GeoGebra, MyOT_G+ kit, propositional logic, mathematical reasoning |\n| --- | --- |\n\nThe rapid advancements in technology, particularly during the Fourth Industrial Revolution, have reshaped various sectors, including education. This era, characterized by the integration of big data, artificial intelligence (AI), the Internet of things, and machine learning, emphasizes the need for innovative teaching strategies that prepare students for complex problem-solving and critical thinking (Hussin, 2018; Layco, 2022) . As traditional  \nrote learning methods struggle to meet these demands, there is a growing call for technology-enhanced learning (TEL) tools that foster deeper cognitive engagement and reasoning skills.  \nGeoGebra, an interactive mathematics software, exemplifies this shift by providing dynamic visualizations that support abstract concept comprehension. Its application in teaching propositional logic aligns with the principles of constructivist learning theory, emphasizing student-centered exploration and inquiry (Fariha & Lestari, 2019; Velichová, 2011) . My online teaching with GeoG","cbCaioBoMkO8Bevt","https://ap.wps.com/l/cbCaioBoMkO8Bevt","pdf",784985,25,"English","# Introduction\n## Technology-enhanced learning and reasoning\n## Role of GeoGebra and constructivist learning\n## Development of the MyOT_G+ kit\n# Research approach and validation\n## Design and development via ADDIE\n## Data collection through interviews and expert review","[{\"question\":\"What problem does the MyOT_G+ kit target in pre-university mathematics?\",\"answer\":\"It targets difficulties in fostering mathematical reasoning, particularly where traditional rote learning does not adequately develop reasoning skills in mathematics.\"},{\"question\":\"Which learning topics are emphasized using GeoGebra in the kit?\",\"answer\":\"The kit focuses on propositional logic subtopics including De Morgan’s laws, and conditional, converse, inverse, contrapositive, and biconditional statements.\"},{\"question\":\"How was the kit developed and validated?\",\"answer\":\"The study used a design and development research approach with the ADDIE model, combining qualitative and quantitative methods, including interviews and validation with input from experts.\"}]","Development and validation of my online teaching with GeoGebra (MyOT_G+) kit on mathematical reasoning among pre-university students | PDF",1792088875,63]