Patent ID: 7383526

Claim:
A method for controlling an optimal cost, which can be applied to a circuitry designing process for making electronic products, allowing a user in drawing a circuitry to choose elements of identical specification but with different unit prices, the method comprising the steps of: (1) integrating data of each of the elements of identical specification but with different unit prices to form an element database; (2) choosing each of the elements required for drawing the circuitry according to the data stored in the element database; (3) choosing each of the required elements of identical specification but with different unit prices for drawing at least one referral circuitry according to the element database and the circuitry drawn by the user; (4) calculating a total cost of the circuitry according to the unit price of each chosen element; (5) calculating a total cost of the referral circuitry according to the unit price of each chosen element; (6) comparing if the calculated total cost of the circuitry is larger than that of the referral circuitry, if yes, proceeds to step ( 7 ); or else, proceeds to step ( 8 ); (7) storing all data of the chosen elements for the referral circuitry; and (8) storing all data of the chosen elements for the circuitry.