Underlying concept | GL original notation | Farrow notation | Note |

Sites or information set; unit of analysis | One unit | Multiple sites i | i = 1 for equivalence |

Investment (expenditure) in cybersecurity | Z | e | Equivalent |

Probability of successful attack given an investment level | S(z) Security breach function | P(e) Terrorism event function | Equivalent (but modified initial limits of prob. not incorporated in Farrow) |

Conditional cost or loss of an event | L Initially, L; later L | C(e) Includes both direct and external, C C = L | GL is constant GL start with L |