A method of determining the critical path of a circuit includes first
determining the paths, their mean path transit times and their path
transit time fluctuations. Paths having similar statistical parameters
are combined to form one path group. For each path group, a statistical
group figure is, then, calculated and, for the totality of paths
considered, a statistical total figure is calculated. Finally, the
critical paths of the circuit are determined by taking into consideration
the total figure, comparing the group figures at or above a critical path
transit time Tc.