Equation 12 · Part 3 · Why Average Success Rate Hides the Failures That Matter Most

Symbol B_i

R = \sum_{i} \Pr(\text{failure mode } i) \cdot B_i

B_i

What this part means

the blast radius assigned to failure mode i : how much of a system, how much data, how many users or how much liability a given failure could plausibly reach, drawn from a small number of severity tiers rather than treated as a continuous unknown.

Its job in the formula

$B_i$ is one factor in the product that computes the quantity on the left.

Full expressionSymbol B_iArticle meaning

Where the article explains it

where $B_i$ is the blast radius assigned to failure mode i : how much of a system, how much data, how many users or how much liability a given failure could plausibly reach, drawn from a small number of severity tiers rather than treated as a continuous unknown.

The passage around this formula

…needs — it treats a wrong word choice and a deleted database as the same unit. A more defensible score weights each discovered failure mode by its consequence rather than counting it once: $R = \sum_{i} \Pr(\text{failure mode } i) \cdot B_i$ . where $B_i$ is the blast radius assigned to failure mode i : how much of a system, how much data, how many users or how much liability a given failure could plausibly reach, drawn from a small number of severity tiers rather than treated as a continuous unknown. This is not a hypothetical scoring scheme;…

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Learn the underlying idea

A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

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