Patent ID: 6973358

Claim:
A defect influence degree evaluation method to be used at a design stage of a product including a plurality of components to calculate an assembly fraction defective, which represents a rate of becoming defective, with respect to an assembly process of each of the components included in the product, and evaluate an influence degree of each component and an influence degree of each process on the basis of the assembly fraction defective and design information of the product, the defect influence degree evaluation method comprising the steps of: previously storing a failure rate of each of the components in a database; extracting component arrangement relations among components included in the product from the design information of the product; calculating a fraction defective of each of the components on the basis of the assembly fraction defective and the failure rate of the component; and multiplying a component fraction defective by a coefficient to obtain a resultant product with respect to each of components each having a relation at time when conducting each assembly process, on the basis of the component arrangement relations and a fraction defective of the component, calculating a numerical value indicating an influence degree of each assembly process by multiplying resultant products for the components each having a relation, and thereby evaluating an influence degree of each component and an influence degree of each process.