Based on the common structure of Q&A forum threads, we will use the following definition to capture near-duplicate threads: Definition 1 Near-Duplicate Thread -Two threads are near-duplicate with each other in Q&A forum: (1) if both of their question and answer parts are the same with each other, or (2) if their question parts are same and one of the answers contains additional information compare to another answer.
figure 6 shows an example of it.