Supporting performance objective 51 of the V-TECS (Vocational-Technical Education Consortium of States) Bookkeeper Catalog, this instructor's manual concerns the completing of purchase invoices. (This module is the sixth in a set of ten on bookkeeping [CE 019 480-489].) The student materials include a pre- and posttest, three instruction sheets with learning activities; a self-checklist (with answer key), sample purchase order forms, and an instructor's checklist. The instructor's manual includes information on using the module and answer keys for the pre- and posttest. The materials are designed for self-paced individual instruction and may be adapted for use with large groups. (A related set of modules on banktelling [CE 019 471-478] is also available.) (JH)