35. A computer-readable storage medium containing computer-executable instructions for identifying gaps in a knowledge base, by a method comprising: generating a concept graph representing concepts of the knowledge base that connects concepts that are related as indicated by the knowledge base; determining whether connectedness between the concepts of the knowledge base is sufficient to adequately represent the concepts of the knowledge base; and indicating the concepts whose connectedness in the knowledge base is not sufficient and thereby identifying gaps in the knowledge base wherein the instructions are executable by a processor of a computer.
35. A computer-readable storage medium containing computer-executable instructions for identifying gaps in a knowledge base, by a method comprising: generating a concept graph representing concepts of the knowledge base that connects concepts that are related as indicated by the knowledge base; determining whether connectedness between the concepts of the knowledge base is sufficient to adequately represent the concepts of the knowledge base; and indicating the concepts whose connectedness in the knowledge base is not sufficient and thereby identifying gaps in the knowledge base wherein the instructions are executable by a processor of a computer. 37. The computer-readable storage medium of claim 35 wherein the knowledge base is a corpus of documents, the concept graph is generated from document concept graphs and includes concepts of the document concept graphs with connections of the document concept graphs that satisfy a connection strength threshold, and the connectedness is based on the conceptual distance and connection strength of concepts.