What is human in the loop?
15 September 2026

What is human in the loop?


Human in the loop involves a human reviewer verifying the output of automated systems, such as the purchase order table, to prevent errors and ensure accuracy, by checking for compliance with organisational policies before approval, and correcting any anomalies or discrepancies found.

The purchase order table in a large organisation's database is often where a human in the loop approval step is placed, as the cost of being wrong is high, with incorrect orders potentially leading to financial losses or damage to the organisation's reputation. Human in the loop refers to the process of having a human reviewer or approver involved in a decision-making or processing step, particularly where the stakes are high or the consequences of error are significant. This can be as simple as a shift supervisor checking the maintenance log to ensure that all necessary work has been completed, or as complex as a category manager comparing two suppliers to determine which one to use.

Definition

Human in the loop is a design pattern that involves placing a human approval step in a process where automated systems are used to make decisions or take actions. This can be in the form of a manual review or approval step, where a human is required to verify or validate the output of an automated system before it is acted upon. The goal of human in the loop is to provide an additional layer of oversight and control, to ensure that the automated system is operating correctly and that any errors or anomalies are caught and corrected.

This definition is important, as it highlights the key role that human reviewers play in ensuring the accuracy and reliability of automated systems. By having a human in the loop, organisations can reduce the risk of errors and improve the overall quality of their decision-making processes.

Differences from related concepts

Human in the loop is often confused with other design patterns, such as human-in-the-loop machine learning or human-computer interaction. However, these concepts are distinct and involve different approaches to involving humans in automated systems. Human-in-the-loop machine learning, for example, involves using human feedback to train and improve machine learning models, whereas human in the loop involves using human reviewers to validate or approve the output of automated systems.

Understanding these differences is important, as it can help organisations to design and implement effective human in the loop systems that meet their specific needs and requirements. By recognising the unique characteristics and benefits of human in the loop, organisations can create more robust and reliable automated systems that are better able to support their decision-making processes.

Applications in large organisations

In large organisations, human in the loop is often used in areas such as finance, procurement, and logistics, where the stakes are high and the consequences of error are significant. For example, a category manager may use a human in the loop approval step to verify that a purchase order is correct and compliant with organisational policies before it is sent to a supplier. Similarly, a shift supervisor may use a human in the loop review step to ensure that all necessary maintenance work has been completed before a piece of equipment is returned to service.

These applications highlight the importance of human in the loop in large organisations, where the complexity and scale of operations can make it difficult to ensure that automated systems are operating correctly. By providing an additional layer of oversight and control, human in the loop can help to reduce the risk of errors and improve the overall quality of decision-making processes.

For more information on how AsscherAi can support human in the loop processes, please visit our website.

Limitations and potential drawbacks

While human in the loop can be an effective way to improve the accuracy and reliability of automated systems, it is not a panacea and has its own limitations and potential drawbacks. For example, human reviewers can be subjective and may introduce their own biases or errors into the process. Additionally, human in the loop can be time-consuming and may slow down the overall processing time of automated systems.

These limitations highlight the need for careful design and implementation of human in the loop systems, to ensure that they are effective and efficient. This may involve providing training and support to human reviewers, as well as implementing controls and safeguards to prevent errors and biases.

When human in the loop is not the right choice

There are certain situations where human in the loop may not be the right choice, such as in applications where speed and efficiency are critical, or where the stakes are low and the consequences of error are minimal. In these cases, automated systems may be sufficient, and human in the loop may actually introduce unnecessary delays or complexity.

In other cases, human in the loop may not be feasible, such as in applications where the volume of data is too high for human reviewers to process, or where the complexity of the decision-making process is too great for human reviewers to understand. In these cases, alternative approaches, such as machine learning or rules-based systems, may be more effective.

If you have any questions about human in the loop or would like to discuss how it can be applied in your organisation, please contact us.

Frequently asked questions

What is the purpose of human in the loop in automated systems

To provide an additional layer of oversight and control, ensuring accuracy and reliability.

How is human in the loop used in large organisations

In areas such as finance, procurement, and logistics, where the stakes are high and errors can have significant consequences.

What are the limitations of human in the loop

Human reviewers can be subjective, introducing biases or errors, and the process can be time-consuming, slowing down automated systems.

When is human in the loop not the right choice

In applications where speed and efficiency are critical, or where the stakes are low and errors have minimal consequences, alternative approaches may be more effective.