The Sociolinguistic Journal of Korea, 13(1). The purpose of this study is to explore the possibility of interface research between English discourse studies and speaking assessment. Assessment expertise has already been interfaced with discourse-based studies to develop and validate oral proficiency tests of English. One of the important developments in language assessment over recent years is the introduction of qualitative discourse research methodologies to design, describe, and validate direct or semi-direct tests of speaking. This paper explored assessment research in the areas of the following discourse studies: interactional sociolinguistics, ethnography of communication, variation analysis, conversation analysis, critical discourse analysis. This review of discourse-related assessment literature showed that discourse studies have much potential for the validation tasks of current oral proficiency tests. Possible areas of discourse studies related to the new era of process-oriented language assessment were discussed.