Plain-English AI definitions for legal professionals. For what bars actually require, see the Legal AI Compliance Register.

Human in the loop (HITL)

Risk and governance Last reviewed 2026-06-11

Definition A design and oversight approach in which a person reviews, corrects, or approves an AI system's output before it takes effect—keeping human judgment between the machine and the consequence.

In more depth

Human-in-the-loop checkpoints are placed where errors would be costly: a lawyer reviews the AI-drafted brief before filing, a supervisor approves an AI-suggested privilege call. The approach works only when review is real—time-pressured rubber-stamping recreates the risk it was meant to remove, a failure mode often called automation bias. Professional-responsibility frameworks generally assume a responsible human remains accountable for AI-assisted work product.

Further reading: Wikipedia.

Related terms

About the editor: MHSB Solutions, Research desk. MHSB Solutions is not a law firm. This glossary is educational information, not legal advice.

Educational information, not legal advice. AI terminology and tools change quickly; definitions reflect usage as of the last-updated date. For what bar associations and courts actually require of lawyers using AI, see legalaicompliance.help and consult a licensed attorney in your jurisdiction.