In e-mail-thread summarization, Dalli, Xia, and Wilks (2004) applied a procedural approach where they recognized named entities and performed anaphora resolution prior to applying ranking metrics to select sentences for inclusion in a thread summary.
for example, for w = 0.5, the precision and recall values of Cluster 16 (figure 8(b)) translate to f-scores of 0.895 and 0.865 for Doc-Pred and Sent-Pred, respectively, leading to a choice of Doc-Pred.