In this article, we extend previous work with respect to interrater reliability measure of computer-mediated conferencing and suggest coding categories relevant to problem-based learning. Calculating interrater reliability agreement by using a Transcript Reliability Cleaning Percentage (TRCP) approach is simple for academics with limited mathematical background and can provide insights into the nature of the learning process from the perspective of categorization of online discourse. TRCP enhances interrater reliability (percentage agreement between coders) of the rating of online transcripts.