操作員必須耗費連續且高度專注力在監控作業上，持續性的警戒或是資訊負荷過高皆可能導致人為失誤的發生。而人為失誤常是造成意外災害的主因。因此瞭解操作員在警戒作業中的狀況是非常重要的。
診斷與監控是操作員在警戒作業主要之任務，運轉人員心智負荷高低會影響診斷與監控作業之績效，進而影響系統的功能與安全。本研究主要探討操作人員的心智負荷與作業績效間之關係，實驗過程中記錄受試者的正確率績效，並量測七項受試者的生理指標變化，包括交感神經╱副交感神經活性指標，心率變化，心跳，舒張壓，收縮壓，眨眼頻率以及眨眼時間等。研究結果發現生理指標與心智負荷狀況有統計上的相關性。並由結果建構一個能夠動態衡量操作員的績效的迴歸模式，進而提升監控時的安全。

It requires a great deal of continuous attention for operator in supervisory systems. Either lacking in vigilance or information overload may lead to human errors and result in calamitous accidents. Therefore, understanding operator mental state in supervisory task is important.
Diagnosis and monitoring are the major tasks of operators in vigilance state. Operator’s mental workload influences his/her performance, and furthermore, affects the system safety and operations. This study investigated the operator’s mental workload of the supervisory task. The performance and the subjective mental workload, NASA-TLX scores as well as seven physiological indexes was assessed and measured. The results indicated that vigilance performance and physiological index are related to subjective ratings, and a regression model was constructed to estimate operator’s mental workload dynamically for further enhancing supervising safety.

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