SECAI Core · phase 8 of 15 · noun

Due diligence

A legal principle that a subject has used best practice or reasonable care when setting up, configuring, and maintaining a system.

The Explain card

Plain English
Due diligence is the legal principle that you took reasonable care and followed best practice when setting up, configuring and maintaining a system. It is about demonstrable effort, not perfection.
Example
A company deploys a third-party LLM in its customer portal. Before launch it reviews the vendor's security documentation, runs a red-team exercise, documents the findings and fixes the serious ones. When a breach later occurs, those records show the company acted responsibly.
Why it matters
After an AI incident, regulators and courts ask what you did before it happened. Evidence of reasonable care can be the difference between a fine and a finding of negligence.
Hook
Did your homework, and kept the receipts.

Word knowledge

How the word is built, where it came from, and what it sits beside in memory.

In a sentence

Before the customer chatbot can read production tickets, security conducts due diligence on the vendor's model card, SOC 2 Type II report, and training-data provenance.

Why these words
  • due Anglo-French deu, owed, from Latin debere, to owe marks the work as the amount that is owed, not leftover extra effort
  • diligence Latin diligentia, attentiveness, from diligere, to single out supplies the head noun, the careful attention the phrase requires
Where it came from
Origin
English legal collocation from Anglo-French deu (owed, from Latin debere, to owe) and Anglo-French diligence (from Latin diligentia, attentiveness)
Entered the language
15th century
What changed
Due had meant owed as a debt, then fitting or adequate. Diligence had meant careful attention, and also haste. English law joined them as the care a matter is owed. The US Securities Act of 1933 made the same pair the name of the investigation an underwriter or buyer performs before a deal, and that investigation sense later filled vendor questionnaires and model-procurement files.
How it is spelled
Pattern
due keeps ue from French deu, not the native dew spelling of the homophone
Pattern
-ence nouns sit beside -ent adjectives
Pattern
Latin dis- plus legere writes di- before l, so diligence has a single l
Breaks the pattern
the noun phrase stays two words; a hyphen appears only when some styles treat it as a modifier
Breaks the pattern
due dropped the b of Latin debitum, while debt, from the same root, kept a silent b
Breaks the pattern
diligence has one l after di-, while intelligence, from the same Latin legere, doubled the l

Spelled like

  • overdue
  • duly
  • diligent
  • intelligence
Broken into chunks
  • due
    • overdue
    • duly
    • undue
  • lig
    • eligible
    • intelligent
    • legend
  • ence
    • difference
    • existence
    • preference
What it sits beside

Same subject

Same shape

  • due process
  • due care
  • due notice
  • due date

Due collocations

  • due process
  • due care
  • due notice

Latin legere family

  • eligible
  • intelligent
  • legend

Governance terms

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.

Neighbours in this phase