16. The method of claim 15 , wherein said representative point is said first document.
15. A method of determining an order in which to read a plurality of documents, the method comprising: using a processor to perform acts comprising: displaying a first document in a document space; calculating dissimilarity between a representative point in said document space and documents in said document space, wherein, at a time of said calculating, a plurality of documents in said document space, including said first document, have been displayed; identifying, using a chooser, a second document in said document space as satisfying a condition as to said second document's level of dissimilarity to said representative point, said condition comprising that said second document has a sufficient level of dissimilarity from said representative point; receiving a selection of said second document; displaying said second document after said first document based on said second document having been found to have said sufficient level of dissimilarity from said representative point, and based on said second document's having been identified by said chooser: and finding a centroid based on said plurality of documents, said representative point being said centroid.