1. A method of determining the behavior of an electronic system comprising electronic components under variability, the method comprising: (1) for at least one parameter of at least one of the electronic components, showing variability defining a range and a population of possible values within the range, each possible value having a probability of occurrence, thereby defining an input domain; (2) selecting inputs randomly from the input domain, wherein the probability to sample (PTS) is obtained from the probability of occurrence (PTOIR) as PTS inputdomain =(PTOIR inputdomain ) (1−gamma) , wherein gamma is a specific non-zero number in the range of about −1 to +2; (3) performing a simulation to obtain the performance parameters of the electronic system, thereby defining an output domain sample; and (4) aggregating the results of the individual computations into the parameter/variability of the electronic system and assigning a frequency of occurrence FoO to the resulting sample being FoO outputdomain =(PTOIR inputdomain ) (gamma) , the parameter variability and the frequency of occurrence defining the behavior.