Overloaded and at Work: Investigating the Effect of Cognitive Workload on Assembly Task Performance
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Summary
This doctoral thesis investigates how cognitive workload and information presentation affect human performance in manual assembly, specifically within mixed-mode production systems characterized by high product variety. The research is motivated by the shift from mass production to mass customization in the automotive industry, which increases the number of product variants and imposes significant cognitive demands on assemblers. Poorly designed information systems and material layouts exacerbate this load, leading to errors and reduced productivity. The study aims to identify factors affecting cognitive performance and determine how material and information presentation can be optimized to support assemblers. The research employed a multi-method approach, beginning with a comprehensive literature review on manufacturing complexity, usability, and cognitive abilities. This was followed by exploration studies, including two case studies and an observational study in industrial settings, to identify relevant factors and current practices. The core of the investigation was a full factorial experimental study designed to test specific hypotheses regarding material and information presentation. The experiment manipulated two main factors: material presentation (comparing traditional material racks against unstructured kits and structured kits) and information presentation (comparing text-and-number instructions against photographic instructions). Performance metrics included assembly time (productivity), error rates (quality), and perceived workload, measured using the NASA TLX scale. The results demonstrated that the method of presenting materials and information significantly impacts assembly performance. Using kits was found to be more favorable than traditional material racks. Specifically, the combination of a structured kit with photographic instructions yielded the best performance outcomes. Unstructured kits also improved productivity and reduced perceived workload compared to material racks, though they were less effective than structured kits. The study noted that while unstructured kits may offer lower costs regarding man-hours and space, the number of components within them must be managed to prevent cognitive overload. The findings confirm that well-designed information and material organization directly alleviate cognitive stress and improve task execution. The significance of this work lies in its practical implications for manufacturing ergonomics and system design. It provides evidence-based scenarios for improving human performance at assembly workstations by aligning material and information presentation with cognitive capabilities. The thesis contributes to the field by bridging usability principles from human-computer interaction with manufacturing logistics, offering a framework for designing stress-tolerant assembly environments. By demonstrating that structured kitting and visual instructions reduce cognitive load, the research supports the adoption of these methods to enhance both quality and efficiency in complex, variant-rich production lines.
Key finding
Using structured kits combined with photographic instructions yields the best performance outcomes by improving productivity and reducing cognitive workload compared to traditional material racks and text-based instructions.
Methodology
mixed_methods
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via author_sweep_intake on 2026-05-27.
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 2 | 2026-05-27 |
| archive | success | canonical_url | — | — | 5 | 2026-06-06 |
| extract | success | cached | — | — | 3 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-04 |
| chunk | success | chunk | — | — | 1 | 2026-06-04 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-04 |
| enrich | success | — | — | — | 1 | 2026-05-27 |
| promote | success | — | — | — | 1 | 2026-06-04 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 2 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 15 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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