BIN YAHAYA, MUHAMMAD ZAKWAN, and MUSLI MOHAMMAD. 2025. “Innovative Redesign of an Umbrella Using Quality Function Deployment (QFD) and Theory of Inventive Problem Solving (TRIZ)”. Research Progress in Mechanical and Manufacturing Engineering 6 (2): 40-49. https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/21475.