This paper gives an overview of the use of Petri nets for the evaluati
on of redundant systems. After listing modelling criteria for this typ
e of system, we describe the powerful characteristics of Petri nets co
ncerning both representation and performance evaluation: descriptive a
bility, formal verification procedures, the ability to incorporate tim
e and quantitative analysis. Finally, we discuss the possibilities off
ered by this theory, as well as certain limitations when it comes to m
odelling large-scale systems such as those usually encountered in indu
strial applications. (C) 1997 Elsevier Science Limited.