Viable system phenomena

System phenomena (also known as and further noted as system identification and modeling) is the science of observing the behaviour of a system. The classification of a dynamic system describes how systems are grouped with certain characteristics into special classes and identify mathematical techniques that apply to these classes of problems.

In particular most systems have five characteristics:

1. linear or nonlinear
2. constant or variable coefficient
3. forced or unforced
4. lumped or distributed parameter
5. deterministic or stochastic