feedback
black box – system where only the inputs and outputs can be viewed, and not its implementation (see "experiment model") Cybernetics – Study of regulatory and purposive systems Interaction – Kind of handshake or communication that occurs as two or more objects have an effect upon one another recursion – Process of repeating items in a self-similar way Resonance – Tendency to oscillate at certain frequencies strange loop – Cyclic structure that goes through several levels in a hierarchical system.