DISCUSSION
This meta-analysis first reports which interaction features have been investigated to operationalize peer-peer interaction in the contextof oral language testing. At the macro level when grouping relevant interaction features into categories, the most-researched interaction categories were, in the order of frequency, signaling comprehension, signaling collaboration, topic management, using questions, and turn- taking. The results indicate a consensus of understanding what peer- peer interaction is among language testers. Interaction categories, such as topic management and signaling comprehension, reflect the dynamic process of communication where interlocutors demonstrate