ADAM MI, Mohammad PTDM, Yahya MS. Innovative Design of Practical Tools for Umrah Training by Using QFD and TRIZ. rpmme [Internet]. 2022 Jan. 17 [cited 2024 Jul. 7];2(2):64-71. Available from: https://penerbit.uthm.edu.my/periodicals/index.php/rpmme/article/view/3655