VNU JOURNAL OF FOREIGN STUDIES, VOL 37, NO 3 (2021) 1 RESEARCH UNDERSTANDING VALIDITY AND RELIABILITY FROM QUALITATIVE AND QUANTITATIVE RESEARCH TRADITIONS Vu Thi Thanh Nha* VNU University of Languages and International Studies, Pham Van Dong, Cau Giay, Hanoi, Vietnam Abstract Educational constructs change over time to reflect developments in research and educational approaches To illustrate the process, this article aims to examine validity and reliability, which are important concepts to justi[.]