What sources could be used to evaluate the performance of people working in the following jobs?

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What sources could be used to evaluate the performance of people working in the following jobs?.

What sources could be used to evaluate the performance of people working in the following jobs?
a. Sales representative
b. TV repairer
c. Director of nursing in a hospital
d. HR manager
e. Air traffic controller

What sources could be used to evaluate the performance of people working in the following jobs?

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