The process usually starts with a demand or requirements – this could be for a physical part (inventory) or a service. A requisition is generated, which details the requirements (in some cases providing a requirements specification) which actions the procurement department. A request for proposal (RFP) or request for quotation (RFQ) is then raised. Suppliers send their quotations in response to the RFQ, and a review is undertaken where the best offer (typically based on price, availability and quality) is given the purchase order.
- standard - a one time buy
- planned - an agreement on a specific item at an approximate date
- blanket - an agreement on specific terms and conditions: date and quantity and amount are not specified.
Purchase orders are normally accompanied by terms and conditions which form the contractual agreement of the transaction. The supplier then delivers the products or service and the customer records the delivery (in some cases this goes through a goods inspection process). An invoice is sent by the supplier which is cross-checked with the purchase order and documents specifying which goods have been received. The payment is then made and transferred to the supplier.
Types of Purchases
Depending on what type of purchase you are going to make, then the process concerned is not the same. The following examples show the different processes that take place concerning the different purchase types.
The consumer purchases for the consumption of themselves, then they fall into this very important category class. They are ultimately driving the economy through the purchase of its products. Therefore, the economy becomes dependent on them.
Facilitated by middlemen for the intention of re-sale to meet others requirements. Agents, wholesalers and retailers come under this category providing their own channels of distribution to the consumer. Examples of these types of companies who facilitate these channels;, 
The purchaser is buying to convert material into finished goods and product. It entails buying raw materials. Components, supplies and consumable stores, spares and tools, machines and equipment and office appliance.
Institutionalised or government purchasing
- Purchasing and Supply Chain Management Kenneth Lyons and Michael Gillingham ISBN 0-273-65764-X
- Purchasing Handbook: Standard Reference Book on Purchasing Policies, Practices, Procedures ... By George W. Aljian
- "What are the types of purchasing". Publishyourarticles.net. Retrieved 2015-05-27.
- "Collection House". Retrieved 2015-05-27.
- "AnyBusiness.com.au". Retrieved 2015-05-27.
- "Food Stuffs". Retrieved 2015-05-27.
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