1. A method for ranking the quality of a first information source of a plurality of information sources with respect to a patent claim in a collaboration and analysis system, the first information source having a first information disclosure, comprising: storing the plurality of information sources in a database; representing the claim as one or more core concepts; for a first core concept, assigning a first core rating based upon a precision of the first information disclosure of the first information source with respect to the first core concept; assigning additional core ratings based upon a precision of the first information disclosure of the first information source with respect to any additional core concepts; and determining a ranking for the first information source with respect to the claim based upon the first core rating and the additional core ratings.