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PLRD-82-56 1 (1982-03-15)

handle is hein.gao/gaobabczy0001 and id is 1 raw text is: 

                   UNITED STATES GENERAL ACCOUNTING OFFICE
                           WASHINGTON, D.C. 20548


PROCUREMENT. LOGISTICS,
AND READINESS DIVISION
                                                MARCH 15, 1982


Dr. Donald P. Hearth
Director, Langley Research Center
National Aeronautics and Space                               I
   Administration

Dear Dr. Hearth:                                               117804

      Subject: ,,The Requirements Determination
                Process Can Be Improved At NASA's
                Langley Research CenterI(PLRD-82-56)

      We have completed our review of the requirements determination
process for stores stocks at the National Aeronautics and Space
Administration's (NASA's) Langley Research Center. Our objective
was to determine the accuracy and reasonableness of the data
elements and methods used to compute requirements.

      Langley manages a stores stock inventory of about 8,000 items
with an inventory value of about $2.6 million. Stores stock items
consist of general support type items of an expendable nature. As
such, Langley uses the Economic Order Quantity (EOQ) method to
determine when and how much to buy. The EOQ principle was designed
to optimize the tradeoffs between the cost of carrying on-hand
stock and the cost of repetitive procurement. Improper decisions
concerning when and how much to buy not only result in unnecessary
inventory management costs, but also cause the inventory manage-
ment activity to maintain and store either too much or too little
stock. In either case, resources are not used prudently, and the
benefits of optimum stock levels are lost.

     We selected a statistical sample of 50 stores stock items and
used these items as the basis for evaluating Langley's demand and
leadtime forecasting methods, safety level requirements, and EOQ
method. We later reduced the sample to 46 items because the low
demand for 4 items resulted in a zero stockage objective.

     To improve the requirements determination process, we believe
that you should

     --change the demand forecasting technique from a moving
        average to a weighted average,




                                                          (943125)

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