Abstract: A method comprising sending query data representative of a query to a first and second query-answering subsystem of a query-answering system. It is determined that the query-answering system lacks a satisfactory answer to the query. Paraphrase data representative of a rephrased version of the query is received. The paraphrase data is sent to the first and second query-answering subsystems. Answer data representative of an answer to the rephrased version of the query is received from the first query-answering subsystem.

Abstract: A method is provided. The method includes determining a number of queries for which an answer was undetermined from a knowledge database and are related to a subject. The method includes determining a period of time associated with receipt of the queries by the knowledge database. The method includes generating, based on the number of queries and the period of time, rate data indicative of a failure rate. The method includes determining that the failure rate satisfies a failure rate condition. The method includes sending text data representative of a query of the queries to a query-answering component different from the knowledge database. Other methods and systems are also provided.