Human Errors

• The error is any action that violates system, tolerence or some limit of system.
• Some user action may leads to error in one system but, May not leads to error in other system.
• The Human machine interface can be unsuccessful due to wrong user intervention and human errors.
• Human error is not limited only to system user.
• The user’s behavioral patterns may lead to some incorrect activities.

Human Errors

a. Error of exclusion

• The action performed is not required to perform.

b. Error of instruction

• The action that should not be performed is actually performed.
• Example,
• The faulty product is passed by quality management team whereas it should not be rejected by him.

c. Extraneous Act

• The action performed is to prevent the system goals.
• Example,
• Using Mobile phone to locate unknown place

d. Sequential Error

• The action performed is not done in a proper sequence.
• Example,
• First put car in first gear and then start the car.

e. Time Error

• The action performed is too much early then the permitted time of action.
• Parking a car after the parking time limit exceeds.