Human errors
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Transcript of Human errors
Human Factors & Errors
Key objectives of HF is to design systems
that
◦ people can use
◦ increase efficiency and performance
◦ minimize the risks of errors
Will define and consider the nature of error
Consider the implications for systems
design
Definition of Human Error
…is an inappropriate or undesirable human
decision or behavior that reduces or has the
potential for reducing the
◦ effectiveness
◦ safety
◦ system performance
Human error
1st blame only the individual
2nd identify other factors. E.g.:-
◦ badly designed or faulty equipment
◦ poor management practices
◦ inaccurate or incomplete procedures
◦ inadequate or inappropriate training
Error Classification
Skill based
◦ controlled by sub-conscious behavior and stored
patterns of behavior
◦ errors usually errors of execution
Rule based
◦ applies to familiar situations - stored rules are applied
◦ errors involve recognizing the salient features of the
situation
Knowledge based - occur in unique & unfamiliar situations
◦ errors result from inadequate analysis or decision
making
Conclusions of Human Errors
Factors are broad & encompass most factors found in other models
Their model includes and emphasizes
◦ management social and psychological factors
Human factors variables are recognized in the categories
◦ physical environment
◦ equipment design
◦ work itself (refer to model diagram in exercise book)
How to Reduce Human
Errors? Human error is inevitable
Consequences and likelihood can be
reduced by:-
◦ better recruitment & selection
◦ training
◦ better design of equipment procedures &
work environment
Reducing Accidents
Apply HF principles to the processes
Provide procedural checklists
Provide training
Provide appropriate & meaningful
feedback
Establish effective employees
feedback system
Eliminate/reduce risk through design
New Employees Hiring &
Training Ensure the hiring policy is attracting
the employees with relevant
experience and skills to perform the
tasks
◦ Provide the new hire with training and
resources to enable employees to
perform the required tasks effectively and
efficiently
◦ Qualify the newly hired employees
training to ensure that employees can
assume and execute their new job
responsibilities
Improve the Performance
Provide effective On the Job Training
Establish robust Standard Operating Procedures to eliminate or reduce the following errors◦ Errors of omission - forget to do something
◦ Errors of commission - doing the task incorrectly
◦ Sequence errors - out of order
◦ Timing errors - too slow - too fast - too late
How to Establish a Robust
SOP Review that the current processes to ensure◦ Adequate Procedures are available for all Major
and minor manufacturing and testing processes
◦ Procedure has clearly stated the process requirements and the personnel responsibilities to complete the tasks
◦ Clear instruction on how to complete the required process tasks Accurately
Sequentially
Timely
◦ If the timing is critical, establish a realistic timeline requirements and provide adequate resources to execute the tasks on time
Monitor the Performance
Classify the source of occurrence as
follows:
◦ Required action is NOT performed or is
performed incorrectly.
◦ Undesired action is exercised.
◦ Information essential for performing the
action is misinterpreted.
◦ Mistake occurs due to complexity.