The measure of information to be developed here will also be related to freedom of choice; that is, it will be a function of the probabilities of choice associated with the alternative courses of action... The measure developed here is a function of m, the number of alternative potential courses of action.

p. 145, as cited in: Galjaard (2009, p. 89): About the information-concept of Ackoff. - On purposeful systems., 1972