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Uncertainty

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Ambiguity

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Complexity

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Volatility

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Risk

a$.$

a characteristic of a program or project or its environment that is difficult to manage due to human behavior, systems behavior, and ambiguiity.

b$.$

a state of being unclear, having difficulty in identifying the cause of events, or having multiple opetions from which to choose.

c$.$

a lack of understanding and awareness of issues, events, paths to follow, or solutions to pursue

d$.$

an uncertain event or condition that, if it occurs, has a positive or negative effect on one or more project objectives.

e$.$

the possibility for rapid and unpredictable change.