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Terms, as a parameter of the need, have a wide variety: delivery time, reception term, planned term, payment term, etc. The company may proceed to their classification, as well as the other above parameters.

Each purchase criterion can be weighted, based on the importance of each of them, through consultation among buyer with all others participating persons in the formulation of business need. Thus, is gained time for carrying out purchase operations and avoid problems that may arise after the purchase, due to lack of dialogue with people interested in product.

External information necessary in the previous purchase step is useful for suppliers prospecting, in order to knowledge their potential offers.

In this respect, the buyer should study suppliers market for discover whether demand can be met by suppliers. The buyer should note that potential offers upon suppliers market can meet his demand or what constraints are involved in obtaining the product.

Many situations may arise, that can go from finding the desired product, up to call into question the opportunity of purchase and is required a period of thinking for assessing the consequences of buying abandoning   or implementation of changes in product demand, the objective is to extend as much competition (Nilsson & Olve, 2001).

Stage own of purchase - itself start by the request of the purchaser and end by agreement between the two parties (buyer and seller), characterized by rigor and formalism.

First should be carried out suppliers’ consultation that can be done in several ways, depending on the criteria for purchasing and suppliers market situation, namely:

1) when there are several hierarchically purchase criteria ranked  and  providers market is characterized by competition it should to proceed to launch an opened offer request  in order to enlarge the competition as much as possible;

2) when there are several purchasing criteria ranked and suppliers market is not characterized by competition can launch a limited call for proposals, addressed only to those suppliers who are susceptible to make the searched product;

3) when there is only one criterion for purchase (generally, the price) it proceed to opened adjudication, if exist competition or to limited adjudication, if the competition on suppliers market is low .

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