8. A system according to claim 7 , further comprising: a frontier candidate integration module configured to match the patterns that comprises the non-matching topic models against the digital information; and a results display module configured to provide the selected articles of the digital information that were matched.
7. A system according to claim 1 , further comprising: a subject area evaluation module configured to compare the topically-limited subject areas of the home evergreen index to the respective topically-limited subject areas for a plurality of the frontier evergreen indexes; and a frontier candidate suggestion module configured to provide the topic models from the plurality of the frontier evergreen indexes that corresponded to the topically-limited subject areas that did not match the topic models that corresponded to the topically-limited subject areas of the home evergreen index.