Language assessment is a field of research that focuses on evaluating and measuring linguistic proficiency, language skills, and communication abilities. This area of study plays a crucial role in various educational, professional, and social settings, such as language learning programs, immigration processes, and job applications. Researchers in language assessment seek to develop and validate assessment tools, such as tests, surveys, and interviews, to accurately and reliably measure individuals' language abilities. They also investigate factors that influence language assessment outcomes, such as test bias, test validity, and test reliability. Moreover, language assessment researchers explore innovative assessment approaches, such as computer-adaptive testing, performance-based assessment, and portfolio assessment, to provide a more accurate and comprehensive evaluation of language proficiency. Overall, the goal of language assessment research is to improve the fairness, validity, and reliability of language assessment practices and promote a better understanding of language skills and abilities.