Online learning has gained more attention in educational institutions recently, and various assessment strategies have been examined to improve performance. Despite these contributions, there is a lack of studies in eastern countries within their own contexts that investigate and compare online and face to face authentic assessment. The purpose of this research is to understand the effectiveness of online and face- to- face instructional methods on students’ performance based on authentic assessment strategy. To achieve this goal, a quantitative method is adopted and paired T- test is applied to analyze the data. The sample consists of 38 female students in sixth grade registered in English subject class in a primary school, and has been taught by the same instructor. The result shows that students who assessed during online class have achieved higher scores than those who assessed in the traditional section. However, the article has presented further explanation, discussion, and a direction for future research.