23. A computer-implemented method of determining how a target entity would categorize a first item from a provider entity, the method being implemented on a computer comprising one or more physical processors executing one or more computer executable instructions which, when executed by the one or more physical processors, cause the computer to perform the method, the method comprising: obtaining, by the computer, a first product identifier that identifies the first item; obtaining, by the computer, a first data structure of the provider entity that describes at least a first category of items, wherein the first category of items comprises a first set of one or more product identifiers that each identifies a corresponding item classified by the provider entity in the first category; obtaining, by the computer, a second data structure of the target entity that describes at least a second category of items, wherein the second category of items comprises a second set of one or more product identifiers that each identifies a corresponding item classified by the target entity in the second category; comparing, by the computer, the first set of one or more product identifiers with the second set of one or more product identifiers; determining, by the computer, that the first category of the provider entity corresponds to the second category of the target entity based on the comparison; determining, by the computer, that the first item from the provider entity is categorized by the provider entity in the first category based on the first data structure; determining, by the computer, that the first item is likely categorized by the target entity in the second category based on the determination that the first category of the provider entity corresponds to the second category of the target entity and the determination that the first item from the provider entity is categorized by the provider entity in the first category; providing, by the computer, an indication that the first item likely belongs to the second category.
26. The method of claim 23 , wherein the first set of one or more items corresponds to a first set of attributes, the second set of one or more items corresponds to a second set of attributes, and wherein the determination that the first category of the provider entity corresponds with the category of the target entity is further based on: comparing, by the computer, the first set of attributes with the second set of attributes.