1. A processor-implemented method for disseminating content associated with a plurality of linked subject items in a knowledge base wherein individual subject items are associated with corresponding user-specific understanding values, the method comprising: ranking at least one of a plurality of candidate subject items for presentation to at least one user based on priority values associated with the candidate subject items, wherein the candidacies are determined and the priority values are computed based, at least in part, on: the user-specific understanding values corresponding to the at least one of a plurality of candidate subject items, the user-specific understanding values of at least one of a plurality of basic subject items linked to the at least one candidate subject item, and the user-specific understanding values of at least one of plurality of advanced subject items linked to the at least one candidate subject item.