Complexity describes that which comprises myriad parts, or which
is complicated in nature. Complexity can be considered as
comprising two forms, detail and dynamic. Detail complexity describes
too many factors to be considered at any one time.
Dynamic complexity describes behaviour we observe which changes over
time, where the patterns of change are familiar but the
underlying factors that produce change over time may be obscured.
Fundamentally, a system is complex when we cannot understand it
through simple cause-and-effect relationships or other standard methods of systems
analysis. In a complex system, we cannot reduce the interplay
of individual elements to the study of individual elements considered
in isolation. Often, several different models, each at a different
level of abstraction, are needed.
Other topics in our resources on Risk Management and Decision Making related to Complexity include: