Following the original idea of lexical chains (Morris and Hirst, 1991), subsequently developed specifically for the purposes of segmentation of expository text (Hearst, 1994), we have adapted an algorithm for discourse segmentation to our document processing environment.
while remaining sensitive to the distribution of "terms" across the document, and calculating similarity between adjacent text blocks by a cosine measure, our procedure differs from that in (Hearst, 1994) in several ways.