1. A method comprising the following computer-executable acts: receiving first that that is indicative of an identity of a user; and responsive to receiving the first data, using a processor to selectively modify a relational model, wherein the relational model comprises atoms and relationships between atoms.
1. A method comprising the following computer-executable acts: receiving first that that is indicative of an identity of a user; and responsive to receiving the first data, using a processor to selectively modify a relational model, wherein the relational model comprises atoms and relationships between atoms. 12. The method of claim 1 , wherein using the processor to selectively modify the relational model comprises: computing signatures for atoms in the relational model; clustering atoms in the relational model based at least in part upon the signatures; and assigning substantially similar values to atoms that reside in a cluster.