Appendix H - Human Performance Evaluation

a. Input detection

b. Input understanding

c. Action selection

d. Action execution.

Facility and equipment operability, procedures and documcentation, and management attitudes are

all part of the work environment that needs to be evaluated for each of these steps. Common problems

that need to be considered are:

Cognitive overload

Cognitive underload/boredom

Habit intrusion

Lapse of memory/recall

Spatial misorientation

Mindset/preconceived idea

Tunnel vision or lack of big picture

Unawareness

Wrong assumptions made

Reflect/instinctive action

Thinking and actions not coordinated

Insufficient degree of attention applied

Shortcuts evoked to complete job

Complacency/lack of perceived need for concern

Confusion

Misdiagnosis

Fear of failure/consequences

Tired/fatigued.

Where high risk is very sensitive to noncompliance with requirements, each of the human

performance factors should be considered in order to achieve a high degree of reliability. These factors

also should be considered in system design/control and operator training, as well as causal factor

determination and corrective action decisions.

H-2

H-1