This book contains many examples of influence diagrams. The idea of influence diagrams is taken from Gerald Weinberg's excellent Quality Software Management series, particularly Book 1: Systems Thinking. The purpose of an influence diagram is to see how the elements of a system affect one another.
 Weinberg, Gerald. 1992. Systems Thinking. Quality Software Management. New York: Dorset House. ISBN: 0932633226.
Influence diagrams have three elements:
Activities, notated as a word or short phrase
Positive connections, notated as a directed arrow between two activities; meaning that more of the source activity tends to create more of the destination activity, or less of the source activity tends to create less of ...