SECAI Core · phase 8 of 15 · noun
Cost-benefit analysis
A decision-making tool used in projects and procurement that compares the cost of a solution against the financial benefit it will provide to determine if it is a sound investment.
The Explain card
- Plain English
- A cost-benefit analysis weighs what a solution costs against the financial benefit it delivers, to decide whether it is a sound investment.
- Example
- A security team proposes an AI gateway with prompt inspection at a six-figure annual cost. The analysis estimates the reduction in data-leak incidents, the avoided regulatory fines, and the engineering time saved by central logging. If expected benefits clearly exceed the cost, the project gets funded.
- Why it matters
- Defenders compete for budget. Framing a control as "this saves more than it costs" wins approvals faster than "this is scary". It also stops you over-spending on risks that are cheap to accept.
- Hook
- Will the lock cost more than the bike?
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
Before the board funds an AI gateway that inspects prompts, finance files a cost-benefit analysis of the six-figure license and last year's leak losses.
Why these words
- cost Old French cost, from Latin constare, to stand at a price names the outlay, so the taking-apart has a price on one side of the ledger
- benefit Latin benefactum, a good deed, from bene well plus facere to do names the gain, so the taking-apart has a return on the other side
- analysis Greek analysis, a loosening, from ana- up plus lyein to loosen supplies the head noun, the taking-apart that holds both sides of the ledger
Where it came from
- Origin
- English economics compound, from Old French cost (Latin constare, to stand at a price), Latin benefactum (a good deed, from bene well plus facere to do), and Greek analysis (a loosening)
- Entered the language
- 1950s
- What changed
- Cost had meant a price paid since Middle English, from standing something at a figure. Benefit had meant a good deed, then a legal privilege, then a pecuniary gain. Analysis had meant a loosening in Greek, then a taking-apart of an argument, then a quantitative study. Mid-century public-works economists hyphenated cost to benefit and hung analysis on the pair, and the three-word label moved from river-basin ledgers into ordinary project review.
How it is spelled
- Pattern
- hyphen joins two nouns used as one adjective before a head noun
- Pattern
- y from Greek upsilon in -ysis, as in analysis and dialysis
- Pattern
- c before o spells /k/, as in cost and constant
- Breaks the pattern
- catalogs also write benefit-cost analysis with the poles reversed; cost-first with a hyphen is the catalog spelling
- Breaks the pattern
- analysis forms its plural as analyses, keeping Greek -es
- Breaks the pattern
- cost-benefit stays hyphenated as a unit; analysis stays a free word
Spelled like
- cost-effective
- risk-benefit
- dialysis
Broken into chunks
-
cost
- costly
- costing
- costless
-
bene
- benefactor
- benevolent
- beneficial
-
ana
- anatomy
- analogy
- anagram
-
lys
- dialysis
- paralysis
- electrolysis
What it sits beside
Same subject
Same shape
- risk-benefit analysis
- cost-effectiveness analysis
- benefit-cost analysis
Governance and risk terms
Hyphenated cost- compounds
- cost-effective
- cost-plus
- cost-recovery
Analysis labels
- gap analysis
- root-cause analysis
- threat analysis
Where it sits in the deck
Phase 8: Governance, Risk, and Compliance Frameworks
Individual controls need a governance envelope — introduce the risk and compliance structures, standards bodies, and regulations that frame AI accountability at scale.
