{"head":{"title":"What Is Human-in-the-Loop (HITL) in AI? | OceanLab","description":"Human-in-the-loop means a person reviews, corrects or approves an AI system's output before it counts. When to use it, how to design it, and mistakes.","canonical":"https://oceanlab.in/glossary/human-in-the-loop"},"crumbs":[{"name":"Home","path":"/"},{"name":"Glossary","path":"/glossary"},{"name":"human-in-the-loop","path":"/glossary/human-in-the-loop"}],"slug":"human-in-the-loop","term":"Human-in-the-loop (HITL)","aka":["HITL","human oversight","human review"],"category":"AI building blocks","short":"A design where a person reviews, corrects or approves what an AI system produces before it takes effect.","body":[["In a human-in-the-loop system, the AI does the first pass and a person decides. The person might approve a drafted reply, confirm extracted fields, review low-confidence cases only, or sign off on any action above a set amount. Their corrections can also feed back into ",{"href":"/glossary/llm-evals","text":"evals"}," and training data."],["Under the EU AI Act, human oversight is a formal duty for ",{"href":"/glossary/high-risk-ai-system","text":"high-risk AI systems"},": people must be able to understand the output, decide not to use it and stop the system."]],"why":["It lets a team get the speed of automation while keeping accountability with a person on the decisions that matter. It is also how most AI automation starts: review everything at first, then move routine, well-measured cases to automatic as evidence builds up."],"example":["A claims system reads incoming documents and fills in the claim form. Fields the model is confident about are filled in; uncertain ones are highlighted for the handler, who checks them against the document shown side by side, then submits."],"inBuild":null,"mistakes":[["Showing the reviewer only the AI's answer and not the source, which turns review into rubber-stamping."],["Reviewing everything forever. Use the data to decide what can safely skip review."],["No record of who approved what, which defeats the point for audits."]],"related":[{"href":"/glossary/maker-checker","label":"Maker-checker (four-eyes principle)","detail":"A control where one person makes a change and a different person must approve it before it takes effect."},{"href":"/glossary/guardrails","label":"Guardrails (AI)","detail":"Checks placed around an AI model that block, fix or flag unsafe, off-topic or incorrect inputs and outputs."},{"href":"/glossary/ai-agent","label":"AI agent","detail":"Software where a language model decides which steps to take and which tools to call, in a loop, to reach a goal."},{"href":"/glossary/high-risk-ai-system","label":"High-risk AI system (EU AI Act)","detail":"An AI system the EU AI Act places in its high-risk class, which brings extra duties before and after it is placed on the market."}],"tools":[{"href":"/tools/ai-automation-roi","label":"AI automation ROI","detail":"Free tool"},{"href":"/tools/eu-ai-act-risk-checker","label":"EU AI act risk checker","detail":"Free tool"}],"links":[{"href":"/ai-automation","label":"AI automation","detail":"How OceanLab automates company workflows with AI."},{"href":"/compliance/eu-ai-act","label":"EU AI Act guide","detail":"Risk classes, duties and the current dates."},{"href":"/ai-labs/human-feedback","label":"Human feedback","detail":"RLHF and SFT data from OceanLab Labs."}],"sources":[],"legal":false,"updatedAt":"2026-10-25"}