Copyright by Kent Beck

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Appendix I. Influence Diagrams

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.[1] The purpose of an influence diagram is to see how the elements of a system affect one another.

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 the destination activity

  • Negative connections, notated as a directed arrow between two activities with a circle over it; ...

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