The basic guideline for supplier development is the "Q.C.D.S" principle, which is the principle of quality, cost, delivery and service.
In these four, the quality factor is the most important, first of all, to confirm whether the supplier to establish a set of stable and effective quality assurance system, and then confirm whether the supplier has the production of the required specific product equipment and process capabilities. Next is cost and price. Value engineering methods should be used to analyze the cost of the products involved and achieve cost savings through win-win price negotiations. In terms of delivery, it is important to determine whether the supplier has sufficient production capacity, whether human resources are adequate, and whether there is any potential for capacity expansion. The last point, and very important, is the supplier's track record of pre-sales and after-sales service.