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 LP + LE for private and external | C(e) Includes both direct and external, CP and CE C = LP + LE | GL is constant GL start with LP, Farrow starts with C = CP + CE = LP + LE and as a function of expenditures |