What is Test-Retest Reliability

This chapter is specifically designed for undergraduate and graduate students of applied linguistics, language education, language teachers, as well as applied linguists. It offers readers a thorough exploration into the intricacies of maintaining credibility and precision in their quantitative research work. The extensive content delves beyond superficial comprehension by presenting an intricate grasp on the fundamental principles required to establish reliability and validity. The chapter will guide readers through an exploration of the fundamental aspects of quantitative research, emphasizing the importance of reliability and validity evaluation. By delving into key concepts and methods for assessing measurement accuracy, consistency, and dependability, readers will acquire a deep understanding that enhances their overall research quality. Upon completion of this chapter, individuals will possess vital comprehension on reliability and validity. Moreover, they shall gain the ability to uphold their research's meticulousness and credibility in quantitative studies.