11. A method for displaying groups of cluster spines, comprising: obtaining groups of cluster spines, each group comprising one or more spines with one or more document clusters each associated with at least one concept; generating group concept score vectors for each of the spine groups by aggregating the concepts for the clusters in that spine group; comparing the group concept score vectors for each of the spine groups and identifying those spine groups that are unique; and placing the unique spine groups into a display by arranging the unique spine groups at equal distance angles around a ring provided centrally in the display.
11. A method for displaying groups of cluster spines, comprising: obtaining groups of cluster spines, each group comprising one or more spines with one or more document clusters each associated with at least one concept; generating group concept score vectors for each of the spine groups by aggregating the concepts for the clusters in that spine group; comparing the group concept score vectors for each of the spine groups and identifying those spine groups that are unique; and placing the unique spine groups into a display by arranging the unique spine groups at equal distance angles around a ring provided centrally in the display. 20. A method according to claim 11 , further comprising: sorting the spine groups by importance based on at least one of size and group concept score vectors.