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2. Purchase order - Wikipedia

   en.wikipedia.org/wiki/Purchase_order

   Purchase order request. A purchase order request or purchase requisition is a request sent internally within a company to obtain purchased goods and services, including stock. The request is a document which tells the purchasing department or manager exactly what items and services are requested, the quantity, source and associated costs.

3. (Q,r) model - Wikipedia

   en.wikipedia.org/wiki/(Q,r)_model

   Constant fill rate for the part being produced: Economic production quantity. Demand is random: classical Newsvendor model. Demand is random, continuous replenishment: Base stock model. Demand varies deterministically over time: Dynamic lot size model. Several products produced on the same machine: Economic lot scheduling problem.

4. Request for quotation - Wikipedia

   en.wikipedia.org/wiki/Request_for_quotation

   A request for quotation ( RfQ) is a business process in which a company or public entity requests a quote from a supplier for the purchase of specific products or services. RfQ generally means the same thing as Call for bids (CfB) and Invitation for bid (IfB). [1] An RfQ typically involves more than the price per item.

5. Economic production quantity - Wikipedia

   en.wikipedia.org/wiki/Economic_production_quantity

   The economic production quantity model (also known as the EPQ model) determines the quantity a company or retailer should order to minimize the total inventory costs by balancing the inventory holding cost and average fixed ordering cost. The EPQ model was developed and published by E. W. Taft, a statistical engineer working at Winchester ...

6. Purchasing - Wikipedia

   en.wikipedia.org/wiki/Purchasing

   Purchasing is the procurement process a business or organization uses to acquire goods or services to accomplish its goals. Although there are several organizations that attempt to set standards in the purchasing process, processes can vary greatly between organizations.

7. Invoice processing - Wikipedia

   en.wikipedia.org/wiki/Invoice_processing

   Invoice Processing : involves the handling of incoming invoices from arrival to payment. Invoices have many variations and types. In general, invoices are grouped into two types: 1. Invoices associated with a company's internal request or purchase order (PO-based invoices) and. 2. Invoices that do not have an associated request (non-PO invoices).