chp1 - ENSC 304 ENSC 304 Human Factors and Usability...

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NSC 304 ENSC 304 Human Factors and Usability ngineering Engineering Instructor: Parvaneh Saeedi 1
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efinition f Human Factors Definition of Human Factors The design of equipment that people use intentionally taking t t h b i t into account how human beings operate. The field of human factors engineering uses scientific knowledge about human behavior in specifying the design and use of a human-machine system. Human factors discovers and applies information about human behaviors, abilities, limitations, and other characteristics … to the design of tools, machines, systems, tasks, and environment… 2 for productive, safe, comfortable and effective human use.
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uman Factors Motto - onor Thy User Human Factors Motto Honor Thy User! ser User Environment ool Task Tool 3
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troduction to Soft Systems Introduction to Soft Systems Systems consist of components arranged in an environment t id tifi d b i t l f ti i t d Components are identified by internal function, inputs, and outputs Inputs to a component are either from the environment, or from outputs of other components Outputs from a component are either to the environment, or to e inputs f other components the inputs of other components System behavior is an emergent property 4
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troduction to Soft Systems Introduction to Soft Systems A system is a view of the world; many views of the same ld ibl world are possible For example, a heating system … 1. Thermodynamic 2. Thermostat control hysical 3. Physical 4. Financial 5. User interface 5
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eating ystem Heating System hermodynamic iew Thermodynamic view 6
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eating ystem Heating System hermostat (cybernetic) control: Thermostat (cybernetic) control: 7
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troduction to Soft Systems Introduction to Soft Systems Soft systems contain humans as some or all of the components Human factors problems are soft systems problems Soft systems problems may have ill-defined or changing requirements and components Effective approaches to soft systems problems generally volve iterative design and testing involve iterative design and testing. Piano Teacher Student 8
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uman Factors and Usability ngineering Human Factors and Usability Engineering Human Machine - Psychophysics - Physics t i i - Perception - Data processing - Cognition - Information theory - Action - Display and actuation 9
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hat is usability What is usability? Usability is defined as five aspects of a product or system that affect the performance, safety, and experience of users: 1. Learnability: users can start to do tasks quickly fficiency: high productivity once learned 2. Efficiency: high productivity once learned 3. Memorability: easy to “come back to” 4. Errors: low rate, easy recovery, none catastrophic 5. Satisfaction: users “like it” 10
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ost Justifying sability Cost Justifying Usability Main steps in New Product Development: 1. Increased Productivity 2. Reduced Reliance on Help Desks educed Costs on Formal Training 3. Reduced Costs on Formal Training 4. Decreased Drop-off Rate 5. Reduced Learning Curve (all of the above) 6. Prevention of catastrophes, fatal accidents 11
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This note was uploaded on 02/03/2011 for the course ENSC 304 taught by Professor Smith during the Spring '11 term at Simon Fraser.

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chp1 - ENSC 304 ENSC 304 Human Factors and Usability...

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