Human-in-the-Loop
Human-in-the-loop (HITL) means a human reviews, approves, or corrects AI outputs at defined points in an automated workflow. It is not a sign that automation failed — it is how you build automated systems that can be trusted with consequential decisions.
What is Human-in-the-Loop?
Human-in-the-loop describes any automated process that includes structured points where a human reviews the AI's output before it proceeds. The human might approve a decision, correct an extraction, resolve an ambiguity, or flag an edge case for escalation. After their input, the workflow continues automatically.
This is different from fully manual processing (human does all the work) and from full automation (AI acts without human review). HITL sits in between — the AI handles the volume and routine cases, the human handles the edge cases and high-stakes decisions.
Where Human Review Belongs
Not every step in a workflow needs human review. The practical question is: what is the cost of an error at this point? A misread supplier name caught before ERP entry is a minor correction. The same error on a confirmed purchase order sent to a supplier is a real problem. Design HITL checkpoints around consequence, not around discomfort with automation.
Low consequence, high volume: Full automation. Route without review.
High consequence, moderate volume: AI processes and flags; human approves before action.
Low confidence, any volume: AI processes and routes to human queue with its reasoning surfaced; human resolves.
Human-in-the-Loop in Operations
In operational automation, HITL is not a temporary measure until the AI gets better. For decisions that involve supplier relationships, financial commitments, or regulatory compliance, human judgment belongs in the loop permanently — not because the AI cannot process the information, but because the accountability cannot be automated away. The goal is not to eliminate human involvement; it is to focus human attention where it adds value: judgment calls, exceptions, and decisions with real consequences. Everything else should run automatically.