Human in the loop: designing review steps into AI workflows

AI models are useful for drafting, summarising, classifying, and extracting information, but they can produce confident output that is wrong. A well-designed workflow does not assume the model is always right. Instead, it puts human judgement exactly where it is needed and makes that judgement quick to apply.

Decide where review belongs

Not every step needs a person. A useful rule is to place review immediately before any action that is hard to undo or visible outside the team, such as:

• sending a message to a customer or partner
• changing a financial or contractual record
• publishing content
• making or recommending a decision about a person

Steps that only prepare internal material, such as a first-draft summary that someone will read anyway, can often run without a dedicated checkpoint.

Make reviewing fast

A review step that takes as long as doing the task manually removes the benefit of automation. Some ways to keep review efficient:

• Show the source next to the output. A reviewer checking an extracted invoice total should see the original document beside it.
• Highlight uncertainty. If the workflow can flag low-confidence fields or unusual values, reviewers can focus their attention there.
• Offer clear actions. Approve, edit, or reject should each be a single, obvious step.
• Batch similar items. Reviewing twenty similar drafts in a row is usually faster than switching between unrelated tasks.

Record what reviewers change

Every edit or rejection is useful information. Logging what reviewers change, and why, shows where the workflow needs improvement: perhaps a prompt needs adjusting, an input is often missing, or a category is regularly misclassified.

Decide in advance when review can be reduced

It can be reasonable to reduce review once a workflow has proven reliable, but that decision should be deliberate. Agree on the evidence you need first, for example a period of operation in which reviewers made few or no material changes, and keep spot checks in place afterwards. For high-stakes actions, it is often appropriate to keep human approval permanently.

Make review meaningful

A review step only works if the reviewer has the knowledge, time, and authority to reject the output. If people are expected to approve large volumes without real scrutiny, the review becomes a formality. Design the workload so that meaningful review is realistic, and make it clear who is responsible for the final result.