• Written by Azhar Aliyar, Director

A shift supervisor checks the maintenance log on the production line, noticing that the new automated system is running in shadow mode, mirroring the current process without actually controlling the equipment. Shadow mode is a mechanism where a system runs alongside the current process, replicating its actions without acting on them, allowing for testing and validation without disrupting the existing workflow. This is particularly useful in large organisations where downtime can be costly and disruptive.

Definition and Explanation

Shadow mode is a direct replica of the current process, with the new system running in parallel, receiving the same inputs and generating the same outputs, but not actually affecting the production line. This allows the shift supervisor to compare the performance of the new system with the existing one, identifying any potential issues or discrepancies before implementing the new system. The goal of shadow mode is to ensure a smooth transition, minimizing the risk of errors or downtime.

The concept of shadow mode is straightforward, yet it requires careful planning and execution to ensure that the new system is properly configured and tested. This involves setting up the system to receive the same inputs as the existing process, and verifying that the outputs are consistent and accurate.

Distinguishing Shadow Mode from Similar Concepts

Shadow mode is often confused with pilot mode, where a new system is tested with a small group of users or a limited dataset. However, pilot mode is a more limited approach, where the new system is only tested with a subset of the data or users, whereas shadow mode involves running the new system in parallel with the existing process, using the same data and inputs. This distinction is crucial, as pilot mode may not accurately reflect the performance of the new system in a real-world setting.

Most people get wrong the idea that shadow mode is a simplified or scaled-down version of the new system, when in fact it is a full replica of the current process, running in parallel. This misconception can lead to inadequate testing and validation, which can have serious consequences when the new system is implemented.

Applications in Large Organisations

In a large organisation, shadow mode can be applied to various systems and processes, such as the purchase order table or the inventory management system. For example, a category manager compares two suppliers using the new procurement system, running in shadow mode, to evaluate its performance and identify any potential issues before implementing it. This allows the category manager to verify that the new system is generating accurate and consistent outputs, and that it is properly integrated with the existing systems.

The use of shadow mode in large organisations requires careful planning and coordination, involving multiple stakeholders and departments. It is essential to ensure that the new system is properly configured and tested, and that all stakeholders are aware of the testing and validation process. For more information on implementing shadow mode in your organisation, you can visit our website here.

Limitations and Misconceptions

Shadow mode does not replace the need for thorough testing and validation of the new system. It is a tool to facilitate the testing process, but it is not a substitute for rigorous testing and quality assurance. Additionally, shadow mode does not guarantee that the new system will work flawlessly in all scenarios, as there may be unforeseen circumstances or edge cases that are not accounted for in the testing process.

Some people believe that shadow mode is a foolproof way to ensure a smooth transition to a new system, but this is not the case. Shadow mode is a useful tool, but it is not a magic solution that can eliminate all risks and errors. It requires careful planning, execution, and monitoring to ensure that the new system is properly tested and validated.

When Shadow Mode is Not the Right Choice

Shadow mode may not be the best approach in situations where the new system requires significant changes to the existing infrastructure or processes. In such cases, a more comprehensive approach to testing and validation may be necessary, involving multiple stakeholders and departments. If you are unsure about the best approach for your organisation, you can contact us here to discuss your specific needs and requirements.

In some cases, the costs and resources required to implement shadow mode may outweigh the benefits, particularly if the new system is relatively simple or low-risk. In such cases, alternative approaches to testing and validation may be more suitable, such as pilot mode or phased implementation. Ultimately, the decision to use shadow mode depends on the specific needs and requirements of the organisation, and should be carefully evaluated and planned to ensure a successful outcome.