The conditions under which a system moves its dynamics from one set of processes to another are often called thresholds. In ecology, for example, a threshold is a point where there is a sudden change in quality, ownership or an ecosystem phenomenon; or when small changes in an environmental engine cause large reactions in an ecosystem.  However, thresholds are a function of several interacting parameters, which changes them in time and space. Therefore, the same system can present a smooth, abrupt or discontinuous change depending on the configuration of its settings. However, thresholds will only be available in cases where abrupt and discontinuous change is possible. On the other hand, there is a more pertinent question than “has there been regime change?” “Is the system vulnerable to regime change?” This question is important, because even if they have shown a smooth change in the past, their dynamics in the future can become abrupt or discontinuous depending on the configuration of their parameters. . . .