Morvarid Derakhshan Andisheh Journal of Quality Engineering and Management 3134-0849 2 1 2012 05 21 Investigating the Effect of Variability Reduction on Product Reliability Using Extreme Value Distributions Investigating the Effect of Variability Reduction on Product Reliability Using Extreme Value Distributions 1 8 235017 FA Fatemeh Arabi .Khajeh Nasiruddin Toosi University of Technology, Iran Hamid Shahriari Department of Industrial Engineering, Khajeh Nasiruddin Toosi University of Technology, Tehran, Iran. Journal Article Reliability is an essential characteristic in any application area and is defined as the probability of performing a specified task under given conditions within a predetermined period of time. In this study, the strength (capacity) of a product and the stress or load applied to it are used to model and calculate reliability.<br>In most cases, the imposed load cannot be controlled; however, various approaches can be employed to improve the capacity of the manufactured product. This paper investigates the effect of reducing variability in each quality characteristic of a product under specific distributions.<br>Analytical and numerical results indicate that decreasing the variability of the product’s quality characteristics increases its capacity and consequently enhances its reliability. Reliability is an essential characteristic in any application area and is defined as the probability of performing a specified task under given conditions within a predetermined period of time. In this study, the strength (capacity) of a product and the stress or load applied to it are used to model and calculate reliability.<br>In most cases, the imposed load cannot be controlled; however, various approaches can be employed to improve the capacity of the manufactured product. This paper investigates the effect of reducing variability in each quality characteristic of a product under specific distributions.<br>Analytical and numerical results indicate that decreasing the variability of the product’s quality characteristics increases its capacity and consequently enhances its reliability.