1. A method comprising performing a machine-executed operation involving instructions, wherein the machine-executed operation is at least one of: A) sending said instructions over transmission media; B) receiving said instructions over transmission media; C) storing said instructions onto a machine-readable storage medium; and D) executing the instructions; wherein said instructions are instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of: automatically assigning items to target categories in a target scheme; wherein the items assigned to the target categories in the target scheme include a first set of items; wherein items in the first set of items have previously been assigned to source categories in a first source scheme that is different from said target scheme; wherein the first set of items includes a particular item; wherein the step of assigning items to categories in the target scheme includes: receiving information about the particular item; determining, from the information, a source category to which the particular item was assigned in the first source scheme; and assigning the particular item to a target category based, in part, on the source category to which the particular item was assigned.