Supporting specific performance objectives of the V-TECS (Vocational-Technical Education Consortium of States) Bookkeeper Catalog, a set of student materials and an instructor's manual on completing sales invoices are included in this module. (This module is the eighth in a set of ten on bookkeeping [CE 019 480-489].) The student materials include a pre- and posttest, three learning activities, a performance posttest, and a self check (with answer key). The instructor's manual includes answer keys to the tests, and sample invoice forms to be duplicated. 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)