探討人員績效表現與健康的議題時，工作壓力、工作負荷、心智負荷與情境知覺都是非常重要的相關考量，若能了解人員在不同作業條件下其績效、心智負荷與情境知覺程度之變化，將會有助於減少產品的不良率和降低人員在職場上罹患職業病或職業傷害。本研究的目的為探討人員在不同的作業負荷下，同時處理不同性質的作業以及作業類別數對其心智負荷變化與建構情境知覺的影響以及不同的作業複雜度對人員績效、心智負荷與情境知覺的影響。 本研究於前測時定義 3 個不同的作業負荷程度（低、中、高）與作業項目總數（48 個），並在後續的正式實驗中探討作業性質、作業負荷程度、類別數與複雜度對於人員績效、心智負荷與情境知覺的影響，本研究利用 NASA TLX 與分析層級程序法（Analytical Hierarchy Process）來評估人員心智負荷的變化，另外也配合 SART 與 SAGAT 來評估人員主、客觀情境知覺之變化。
實驗結果指出在單純從事主作業的情形下，人員在高作業負荷程度時的績效顯著較差，但當作業負荷程度提升至中等時，人員之情境知覺程度即受影響，但作業負荷程度對心智負荷程度較無影響；作業類別數增加至 2 種時，人員之客觀情境知覺程度即受到影響，若增加至 3 種時，績效、心智負荷與主觀情境知覺程度都將受到影響。另外在分時作業的情況下，作業負荷程度與作業類別數分別對人員的客觀情境知覺程度與心智負荷程度有所影響；從事視覺型次作業類型之受試者在本實驗中的績效與情境知覺程度皆較從事聽覺型次作業類型之受試者為佳，此外作業類別數對於人員形成較高的心智負荷程度之影響力並不亞於作業負荷程度。最後，作業複雜度的部分則發現當複雜度升高至中等程度時，人員的績效與情境知覺程度較差，且心智負荷程度升高。

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