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a phenomenon where the effect of one variable on another does not occur immediately

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1. a phenomenon where the effect of one variable on another does not occur immediately. Delays result from decisions often requires a long period of time to be effective. delays can result in overshoot or oscillation
2. a process that checks for unit consistency in equations. the saying "one can't add apples and organes" shows why dimensional analysis is necessary. dimensional inconsistency is a sign of an incorrect equation
3. the opposite of aggregation. disaggregation is done to separate variables that doe not have similar effects on system behavior
4. length of time it takes an exponentially growing quantity to double in size. if a rate flowing into a level equals a multiplier times the level, then doubling time equals approximately 0.7 divided by the multiplier.
5. a model that deal with relationships that varies with time
6. an equation-based simulation language for system dynamics modeling on MS Windows computers
7. opposite of exogenous, meaning internal. an endogenous view approaches a problem searching for its causes and cures within some boundary. Endogenous variables affect and are affected by the rest of the system
8. a situation in a dynamic system where the inflows and corresponding outflows balance, and the levels cease to change
9. the opposite of endogenous. an exogenous view considers systems under the influence of outside events that are not part of the internal dynamics of the system. an exogenous variable is an outside variable that affects but is not affected by the behavior of the system
10. behavior that occurs when ther ate of the growth depends on the size of the stock at that point in time. as the stock gets larger, its growth gets progressively faster. or, for decay, as the stock gets smaller, the decay gets progressively slower. exponential growth/decay has a doubling time. associated with positive feedback, or half-life associated with decay