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Our approach to this section is to provide an awareness of the types of technical decisions SEs need to understand concerning the development of systems that require human-in-the-loop (HITL) interations with a system. Since Human Factors Engineering (HFE) is a specialty engineering discipline, we approach HSI from an SE perspective as illustrated in Figure 44.1. Speci cally, our topics of discussion include: Human interface classes Human factors Human System Integration (HSI) Elements HSI issue areas Task attributes
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Human I/F Classes
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Functional Information Environmental Operational Organizational Cooperation Cognitive Physical
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Personnel Element Equipment Element Mission Resources Element Procedural Data Element System Responses Element
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Human Factors
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Anthropometric Sensory Cognitive Phsychological Physiological
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Human System Integration (HSI) Elements
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Human Factors Engr. Manpower Personnel Training Safety Health Hazards Human Survivability
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Task Attributes
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Mission Function Job Duty Task Subtask Task Element
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HSI Issue Areas
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Allocation of Function Anthropometrics & Biomechanics Communications & Teamwork Computer Human Interface (CHI) Displays and Controls Documentation
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Figure 44.1 SE Human Factors Considerations
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44.3 Human System Interfaces
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s 18 through 20 System Operations Concepts introduced the System Operations Model. The model provides an initial framework for de ning HOW a system s pre-mission, mission, and postmission phases of operation might be constructed. The framework consists of serial and concurrent operations and tasks to be performed to accomplish OBJECTIVES established for each phase of operation. The System Operations Model framework presents a challenge: WHICH individual or combinations of System Elements such as EQUIPMENT or PERSONNEL should be allocated requirements for performing the OPERATIONS and TASKS On the surface, this sounds simple. However, further investigation REVEALS new questions that must be answered rst: 1. WHAT capabilities and levels of performance can the EQUIPMENT Element provide with current technologies and resource constraints such as cost and schedule 2. WHAT skills and levels of performance do members of the PERSONNEL Element currently possess or can be trained to perform 3. WHAT level of risk are we willing to accept in the PERSONNEL and EQUIPMENT elements. We can ultimately condense these questions into: WHAT types of operations and tasks can the EQUIPMENT Element and PERSONNEL Element or combinations of the two perform best To answer these questions, we need to identify the key strengths of PERSONNEL and EQUIPMENT performance.
Key Strengths of Human Performance
Humans excel in a number of skills and mental strengths when contrasted with EQUIPMENT. In general, human performance exceeds EQUIPMENT performance in the following areas: 1. 2. 3. 4. 5. 6. 7. 8. 9. Value-based judgments and decisions Priority selections Resource allocations over time Impromptu tasks Creative, nonrepetitive tasks Sensitivity to painful conditions Human communications Smell and touch Adaptive behavior
Author s Note 44.1 Numbered items in the list above and below are for reference purposes and SHOULD NOT be interpreted as rank ordered list.
Key Strengths of EQUIPMENT Performance
In contrast, EQUIPMENT, when designed correctly from a User s perspective, excels in other areas when compared with humans. In general, EQUIPMENT performance exceeds human performance in the following areas: 1. Processing, storing, and retrieving vast amounts of data. 2. Computing complex algorithms and trends in a short period of time.
Human System Integration
3. Transmitting and receiving large amounts of error-free data under time constraints. 4. Arti cially controlling human performance under prescribed safety conditions aircraft performance. 5. Sensing and analyzing microscopic scale variations in electrical, mechanical, optical, environmental, and chemical conditions. 6. High-speed, noncreative, repetitive tasks such as mass production. 7. Controlling high-risk operations that pose safety and health threats to humans and the environment such as steel mill, handling hazardous and toxic materials. 8. Leveraging human physical capabilities. 9. Measuring parameters such as time, mass, and material composition. Guidepost 44.1 Given this comparison of strengths, how do SEs determine the appropriate allocation and mix of performance-based operations and tasks to the EQUIPMENT and PERSONNEL elements First, let s identify the types of human system interfaces that provide the basis for decision making.