DissertationAuthors: Wei, Yu; Advisor: Nguyễn, Hoa; Dương, Thu Mai (2023)
Validity acts as the most important quality of a test in language testing and assessment field. Theoretical exploration and empirical studies have never ceased to emerge on the validity of tests. Admittedly, validity is not limited to the test product, but is related to the process of producing the test product. Understanding the measured traits requires a deep exploration of the cognitive process required by the test taker to complete the test tasks in the test. In Vietnam, one of the significant achievements in English language testing and assessment is the emergence of Vietnamese Standardized Test of English Proficiency 3-5 (VSTEP.3-5). Like other large-scales and high-stakes tests... 
