Abstract: Methods and systems for managing agents and threads that form part of a virtual personal assistant system. One of the methods includes receiving a user request; associating a first agent with a triage state and a second agent with a queue state; providing a first thread associated with the user request to the first agent; receiving from the first agent at least one task to be performed to respond to the user request, the task forming part of the first thread; providing the first thread to the second agent, and removing the first thread from the second agent if the second agent does not act on the first thread according to a specified criteria, wherein an agent can only be in one of the triage state or the queue state at one time and an agent can work on a second thread only after stopping work on the first thread.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for resolving inconsistencies in information graphs.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for identifying user-specific values for entity attributes. One of the methods includes maintaining data representing a particular cluster of a plurality of claims about a particular entity, wherein each claim is an assertion by a respective claimant about an attribute value of the particular entity; receiving a request for a value of a particular attribute of the particular entity that has been submitted by a requesting user; determining, from attribute values for the particular attribute identified by the claims in the particular cluster, a user-specific attribute value for the particular attribute value; and providing the user-specific attribute value in response to the request.