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Human-on-the-loop (HOTL)

By Updated

The oversight mode in which a person can intervene in the design cycle and monitors the system's operation, rather than approving each decision 1. The system acts; people watch the signals and can stop it, so the stop path and the alerting are what must be tested.

Developed in
ch. 11, From definition element to registry field
Chapters
ch. 11, AI Defined
Contrast with
Human-in-the-loop (HITL) · Human-in-command (HIC)
Source
1 numbered reference, listed below

Commonly confused

  • Human-in-the-loop (HITL) versus Human-on-the-loop (HOTL)

    Human-in-the-loop (HITL)
    The oversight mode in which a person can intervene in every decision cycle of an AI system; in engineering terms, a gate that holds each consequential action until a named approver decides, logging…
    Human-on-the-loop (HOTL)
    The oversight mode in which a person can intervene in the design cycle and monitors the system's operation, rather than approving each decision.

    The differenceA person approves each consequential decision, against a person monitors and can stop the system.

    Why it mattersHITL is evidenced by approval logs and override rates; HOTL by alerting and a tested stop path.

Where it is used

3 chapters of the Body of Knowledge use the term. Each link opens the first section that does.

Human-on-the-loop (HOTL): mentions per chapter4 mentions of the term across 3 of the 23 chapters of the Body of Knowledge; the chapters the glossary cross-references are drawn solid.Cross-referenced chapterOther chapter11 AI Defined: 2 mentions11 AI Defined214 Development: 1 mention14 Development122 Principles & Standards: 1 mention22 Principles & Standards1No mentions in the other 20 chaptersSource: the Body of Knowledgev0.5.0
Human-on-the-loop (HOTL): mentions per chapter4 mentions of the term across 3 of the 23 chapters of the Body of Knowledge; the chapters the glossary cross-references are drawn solid.Cross-referenced chapterOther chapter0001020304050607081011 AI Defined: 2 mentions211121314 Development: 1 mention1141516171819202122 Principles & Standards: 1 mention12223Source: the Body of Knowledge v0.5.0
Mentions per chapter How often each chapter names the term, with the chapters the glossary cross-references drawn solid. The longest bar is where to read the term in use; bars spread across many chapters mark a term that runs through the discipline.
Mentions as a table
Mentions of Human-on-the-loop (HOTL) per chapter
ChapterMentionsCross-referenced
00 Preface0No
01 Definition0No
02 Why Now0No
03 Values & Principles0No
04 The Stack0No
05 Patterns0No
06 The Role0No
07 Maturity Model0No
08 Regulatory Map0No
10 Reading List0No
11 AI Defined2Yes
12 Governance Program0No
13 Risk Management0No
14 Development1No
15 Deployment0No
16 Fairness & XAI0No
17 Incidents0No
18 EU AI Act0No
19 Privacy & AI0No
20 Existing Law0No
21 AI Laws Worldwide0No
22 Principles & Standards1No
23 AI Agents0No
Human-on-the-loop (HOTL): related terms and patternsThe term at the centre; related terms on solid edges, the terms it is contrasted with on dashed edges, and the patterns that use it most in the colour of their layer.RelatedContrastHuman-on-the-loop (HOTL)Related terms (2)Adaptiveness · RelatedAdaptivenessIntended purpose · RelatedIntended purposeContrast with (2)Human-in-command (HIC) · ContrastHuman-in-command (HIC)Human-in-the-loop (HITL) · ContrastHuman-in-the-loop (HITL)
Human-on-the-loop (HOTL): related terms and patternsThe term at the centre; related terms on solid edges, the terms it is contrasted with on dashed edges, and the patterns that use it most in the colour of their layer.RelatedContrastRelated terms (2)Adaptiveness · RelatedAdaptivenessIntended purpose · RelatedIntended purposeContrast with (2)Human-in-command (HIC) · ContrastHuman-in-command (HIC)Human-in-the-loop (HITL) · ContrastHuman-in-the-loop (HITL)Human-on-the-loop(HOTL)
The term's neighbourhood Terms related to this one on solid edges, terms it is often confused with on dashed edges, and the patterns that use it most in the colour of their layer. Follow a dashed edge to check the distinction before you use either term.
Neighbourhood as a table
Neighbourhood of Human-on-the-loop (HOTL)
FamilyItemRelation
Related termsAdaptivenessRelated
Related termsIntended purposeRelated
Contrast withHuman-in-command (HIC)Contrast
Contrast withHuman-in-the-loop (HITL)Contrast
  • Adaptiveness

    The ability of an AI system to change its behaviour while in use, through learning after deployment; optional under the EU AI Act definition.

  • Intended purpose

    The use for which the provider intends an AI system, including its specific context and conditions of use.

Sources

  1. [1] Ethics Guidelines for Trustworthy AI (four ethical principles; seven requirements; human-in-the-loop, human-on-the-loop and human-in-command oversight). High-Level Expert Group on AI / European Commission. 2019-04-08. https://digital-strategy.ec.europa.eu/en/library/ethics-guidelines-trustworthy-ai (verified: primary)

Definitions of legal terms paraphrase the cited text, which governs. Dated statements are as of .

Cite this term

García Aibar, J. (2026). Human-on-the-loop (HOTL). In AI Governance Engineering: The Thesis & Body of Knowledge (v0.5.0), Glossary. https://doi.org/10.5281/zenodo.22956197. https://aigovernanceengineer.com/glossary/human-on-the-loop-hotl. CC BY 4.0

BibTeX

@misc{aige2026humanontheloophotl,
  author  = {Jorge García Aibar},
  title   = {{Human-on-the-loop (HOTL)}},
  note    = {Glossary, AI Governance Engineering: The Thesis \& Body of Knowledge, version 0.5.0},
  year    = {2026},
  doi     = {10.5281/zenodo.22956197},
  url     = {https://aigovernanceengineer.com/glossary/human-on-the-loop-hotl}
}