Application of the scientific knowledge of human capabilities and limitations to the design of systems and equipment to produce products with the most efficient, safe, effective, and reliable operation
Application of the scientific knowledge of human capabilities and limitations to the design of systems and equipment to produce products with the most efficient, safe, effective, and reliable operation
Interface points
Interface points
Environment
Skill level of user
Interaction between:
Human element
Hardware element
Software element
Memory
Memory
Long term
Short term
Thinking and reasoning
Visual perception
Dialogue construction
Individual skill level
Individual sophistication
Using 5% female to 95% male reach data, design an anesthesia machine layout….
Using 5% female to 95% male reach data, design an anesthesia machine layout….
What constraints does this put on the design?
What % overall of the population would be served?
Analytic process that focuses on device objectives
Analytic process that focuses on device objectives
Design and development process that converts results of analyses into detailed equipment features
Test and evaluation process which verifies that development process satisfies constraints
Planning
Planning
Analysis
Conduct user studies
Observations
Interviews
Focus groups
Task analysis
Benchmark usability tests
User profile
Setup advisory panel
Should reflect system and personnel safety factors
Should reflect system and personnel safety factors
Failures
Fail safe
Failure indications
Standards- ANSI, AAMI, ISO
Written to meet needs of various target populations
Written to meet needs of various target populations
Study capability and information needs of documentation users
Mental abilities
Physical abilities
Previous experience
Understanding of general operation
Special needs of environment
Science of measuring human body and its parts and functional capacities
Science of measuring human body and its parts and functional capacities
Range of values: 5th percentile female to 95th percentile male
Functional dimensions
Psychological elements
Workstation design considerations
Labels should be clear and direct
Labels should be clear and direct
Controls, displays, and other equipment that must be located should be clearly marked
Receptacles and connectors should be marked with intended function or connection
Hazard warnings should be prominent
Every user input should consistently produce some perceptible response from the computer
Every user input should consistently produce some perceptible response from the computer
Log-on should be automatically completed before any operation
Allow for orderly shutdown in case of failure
Consistent data entry transactions
Consistent data entry transactions
Minimize user input actions
Feedback to user about acceptance or rejection of an entry
Ability to change entry after it has been added
Present status, information, confirmation, and verification throughout the interaction
Present status, information, confirmation, and verification throughout the interaction
Standby should be accompanied by ‘WAIT’ message
Feedback should be self-explanatory
Commands, error messages, system capabilities, and procedures should be explained with prompts or help instructions
Commands, error messages, system capabilities, and procedures should be explained with prompts or help instructions
Missing data/aborting changes should be prompted
Factual and informative dialogue
Displayed in standardized area
Currently defined default values should be provides and automatically displayed
Currently defined default values should be provides and automatically displayed
User should be prompted for acceptance of defaults
Users should be able to set their own default
T = a + b log2 (D/W + 1)
T = a + b log2 (D/W + 1)
where
T = the average time taken to complete the movement
A = the start/stop time of the device
B = the inherent speed of the device
D = the distance from the starting point to the center of the target
W = the width of the target measured along the axis of motion.
