A tax practitioner who, by passing an examination given by the . Treasury Department, can represent taxpayers before the Internal Revenue Service. Enterprise Resource Enterprise Resource Enterprise Resource Enterprise Resource Planning Planning Planning Planning (ERP) (ERP) (ERP) (ERP) A business management system that integrates all facets of the business to the related financial reporting functionality. Software applications have emerged to help business managers implement ERP in business activities such a planning, manufacturing, sales, marketing, inventory control, order tracking, and finance. ERP attempts to integrate.