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Level 3 of the Purdue model best represents Manufacturing Execution Systems (MES), which serve as a bridge between the control level and enterprise level operations within a manufacturing environment. These systems are crucial in managing and monitoring work-in-progress on the factory floor, ensuring that production runs efficiently and effectively.

Manufacturing Execution Systems provide real-time data regarding production metrics, allowing for immediate adjustments to processes based on the performance of machinery, workforce, and materials. This level integrates the physical processes directly with enterprise systems, ensuring that the information flow facilitates informed decision-making and helps optimize operations.

The other levels in the Purdue model correspond to different operational aspects; for instance, other options focus on higher-level enterprise systems or physical processes without encapsulating the critical functions performed at Level 3 within the context of production management. This distinction underlines why Manufacturing Execution Systems are specifically identified as defining features of Level 3 in the Purdue model.