Evaluation and Decision-Making Method for Maintainability Design Based on Fuzzy Preference

Considering the uncertainty of maintainability design factors and the fuzzy preference information in evaluation values, an evaluation and decision-making method of maintainability was proposed. The linguistic assessment values of maintainability design factors were converted to trapezoid fuzzy numbers by fuzzy set theory, and decision weights under fuzzy preference were given based on maximizing deviation method. Then, evaluation model of maintainability design was established, and confidence index of evaluating decision was given. At last, a case study was given and the result showed that the method is reasonable and effective for maintainability evaluation.