The manufacture of parts as standard units is not an accounting problem, but the accounting department and the manufacturing departments must coöperate in maintaining proper records of the manufacture of those parts. The manufacture of one lot of standard units involves the same operations whenever the same unit is made. Adopting this principle to accounting, it is advisable to establish standards in respect to orders. Whenever the same standard part is needed, the order should be for the same quantity; this, of course, after a standard quantity has been established. When units and quantities have been standardized, order numbers should be made standard──whenever the same work is to be done the _same order number_ should be used. If this plan is followed, orders are soon recognized by number──and the order number informs the foreman as to the work required. Series of order numbers should be assigned for different classes of work. Numbers 1 to 100 might represent regular plant maintenance and repair orders; numbers 101 to 200, plant construction and special repair orders; numbers 201 to 400, the manufacture of special tools; numbers 401 to 1000, the manufacture of parts; numbers 1001 to 1500, assembling or production orders for complete machines. Shop orders can be distinguished by a second series of numbers starting at, say 5000. Illustrating the above, the superintendent of a typewriter factory might receive order number 1007, meaning that he is to assemble 1000 No. 7 typewriters. His assembling order to the foreman would bear the same number. After the parts have been drawn from the parts storeroom, it may be found that the stock of certain parts is running low. Production orders are issued for parts, No. 417 being the number for frames for No. 7 machine. The shop orders may bear the numbers 5060─_a_, 5060─_b_, and 5060─_c_, _a_ being the order for the foundry, _b_, the order for the machine shop, and _c_, the order for the finishing department. [Illustration: Fig. 45. Manufacturing Order Register, Showing Location of Work in the Shop] As to expense orders and construction orders, it is very necessary that the work to be charged against each order number be clearly specified. When the expenditure involved exceeds a certain amount, or where the work is of a special nature, a special order should be required. Explicit instructions for charging all expense items should be given to each foreman, preferably in printed form──or in typewritten form when the number of foremen is small. Many concerns issue printed instruction books containing the order numbers and specifications, with any rules that may be in force governing the conduct of employes, for general distribution among employes. RECORDS OF MANUFACTURING ORDERS