The state of being vague and poorly defined. Indeterminism is a key idea in chaos, catastrophe, and complexity theories. S. Lash, B. Szerszynski, and B. Wynne (1996), writing on environmental issues, note that ‘a recognition of the intrinsic indeterminacy of the future, and of all our roles in shaping that future, imposes on us all the duty to take responsibility for the future we are making’.