In complex systems cause and effect are often not closely related in either time or space. The structure of a complex system is not a simple feedback loop where one system state dominates the behavior. The complex system has a multiplicity of interacting feedback loops. Its internal rates of flow are controlled by nonlinear relationships. The complex system is of high order, meaning that there are many system states (or levels). It usually contains positive-feedback loops describing growth processes as well as negative, goal-seeking loops. In the complex system the cause of a difficulty may lie far back in time from the symptoms, or in a completely different and remote part of the system. In fact, causes are usually found, not in prior events, but in the structure and policies of the system.
Jay Wright ForresterRelated topics
cause complex control different difficulty far found flow high lie loop meaning multiplicity order simple space state well feedback StatesRelated quotes
The huge human brain, approximately 1,350 cubic centimeters, is the most complex organic structure in the known world. Understanding the human mind/brain mechanisms in evolutionary perspective is the goal of the new scientific discipline called evolutionary psychology. Evolutionary psychology focuses on four key questions: (1) Why is the mind designed the way it is-that is, what causal processes created, fashioned, or shaped the human mind into its current form? (2) How is the human mind designed-what are its mechanisms or component parts, and how are they organized? (3) What are the functions of the component parts and their organized structure-that is, what is the mind designed to do? (4) How does input from the current environment interact with the design of the human mind to produce observable behavior?
David Buss
I met him Cummingham around 1953 after a performance I saw. He was teaching and making dances for his company and was already working with John Cage. What interested me initially wasn't just the movement but also the music he worked with, which was unfamiliar to me... Later Bob Rauschenberg had been doing sets and costumes for the Cunningham Company... I can't say exactly how, but for a period of time, Cage, Cunningham, Rauschenberg, and I saw each other frequently and exchanged ideas. John [Cage] was very interested in presenting his ideas to other people, so it was impossible to be around and not to learn... He could apply his ideas on space and time to painting, or music or architecture... I don't have a clear sense of cause and effect in my painting, but it is probably there.
Jasper Johns
In this very special form, feedback became part of the jargon of Group Dynamics, which has also assumed many of the characteristics of a cult in the efforts made to conserve some of the rigor of procedure with which Kurt Lewin and the experimentalist, Alex Bavelas, had attempted to imbue it. In this case, far from serving as a catalyzing, high-level theoretical tool, the term feedback has become a jargon-catchall for any kind of report back to government, management, the subjects of an experiment, subjects during an experiment, and so on. Stripped of its intellectual potential, the term knocks about the corridors of Unesco and for the most part those who use it have no idea that this bit of enjoined, Group Dynamic-recommended behavior is in any way related to the forbidding cross-disciplinary integration known as cybernetics.
Margaret Mead
In recent weeks, we have taken bold steps to prevent a severe disruption of the American economy, which would have a devastating effect on other economies around the world. We've promoted stability in the markets by preventing the disorderly failure of major companies. The Federal Reserve has injected urgently needed liquidity into the system. And last week, I announced a decisive action by the federal government to address the root cause of much of the instability in our financial markets, by purchasing illiquid assets that are weighing down balance sheets and restricting the flow of credit. I can assure you that my administration and our Congress are working together to quickly pass legislation approving this strategy, and I'm confident we will act in the urgent time frame required.
George W. Bush
Data management housekeeping is not the only problem to plague oversimplified approaches to high speed computation. The physical problems which are of practical interest tend to have rather significant complications. Examples of these complications are as follows: boundaries are likely to be irregular; interiors are likely to be inhomogeneous; computations required may be dependent on the states of the variables at each point; propagation rates of different physical effects may be quite different; the rate of convergence, or convergence at all, may be strongly dependent on sweeping through the array along different axes on succeeding passes; etc. The effect of each of these complications is very severe on any computer organization based on geometrically related processors in a paralleled processing system.
Gene Amdahl