Asmar L, Grigoryan K, Low CY, Roeltgen D, Kühn A, Dumitrescu R. Structuring Framework for Early Validation of Product Ideas. IJIE. 2020;13(2):229-240. Accessed April 15, 2026. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/7648