Effect of individual components on system's reliability: A case of web‐based US Federal Highway Administration project recommendation and approval software

Abstract

Purpose

The purpose of this study is to examine the effect of individual components' reliability on a system's reliability. The system refers to the Financial Management Information System (FMIS), the US Federal Highway Administration's (FHWA) web‐based project approval and tracking software. Its components are 61 project information fields.

Design/methodology/approach

The analysis would view each highway project‐funding request as an activity with cycle‐dependent performance for which success probability can be calculated as Reliability, R. The reliability analysis of the 61 FMIS fields results in a series system with R_sys the “estimated reliability” of finding “true” values in all 61 information fields during one highway‐related project funding authorization review.

Findings

Of an estimated 200 projects approved, there was previously estimated a 50 percent to 80 percent unreliability rate, while the study found an unreliability rate of approximately 80 percent.

Research limitations/implications

Owing to the nature of federal government software, data can be very difficult to acquire in this working environment, but a simple calculation was relatively successful in confirming the “estimated reliability” of finding “true” values and showing how the reliability could dramatically decrease.

Originality/value

The paper contributes to the applicability of reliability analysis to project approval software, showing the progression from estimated data to bounding the estimate using reliability theory.

Citation

Chandler, M.R. and Affan Badar, M. (2009), "Effect of individual components on system's reliability: A case of web‐based US Federal Highway Administration project recommendation and approval software", International Journal of Quality & Reliability Management, Vol. 26 No. 6, pp. 614-628. https://doi.org/10.1108/02656710910966156