1. A system comprising: a processor; and one or more computer readable storage media accessible by said processor and storing computer instructions executable by said processor to implement an interface layer between one or more users and a master entity index (MEI) system, said interface layer comprising a set of interfaces and business services, wherein each of said business services is defined according to a data model, is associated with one of said interfaces, and comprises one or more operations, wherein each of said one or more operations is associated with a logical procedure to interact with said MEI system, and wherein said logical procedure is defined by said one or more users via a set of graphical objects on a graphical interface.