SASHA V. ILYUKHIN, TIMOTHY A. HALEY,

JOHN W. LARKIN

Over the past decade, food manufacturers have increasingly adopted computer-based systems for process control. This is primarily due to data accessibility, application flexibility, and low cost provided by microprocessor technology. However, microprocessor-based control systems are more complex than the mechanical and pneumatic devices they replace and require a thorough validation to ensure adequate reliability.

Control System Validation Key to Automated Food ProcessingControl system validation is a set of measures to ensure that a new or reengineered …



Table 1 Software testing steps

Fig. 1—Software reliability testing. Adapted from Musa (1989)



Fig. 2—PMA quality life-cycle approach. Adapted from Deitz and Herald (1993)

Fig. 3—Modified life-cycle approach. From McKinstry et al. (1994)



Table 2 Critical questions to ask a third party (vendor) about its software control system. Adapted from Abel (1993)


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