The strategic approach to the effective and efficient management of people in a company or organization such that they help their business gain a competitive advantage

What
Human resource management (HRM or HR) is the strategic approach to the effective and efficient management of people in a company or organization such that they help their business gain a competitive advantage. It is designed to maximize employee performance in service of an employer's strategic objectives.


Human Resource Planning

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  HR Planning includes all activities managers do to forecast current and future HR needs.
  
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    Must be done prior to recruitment and selection
    
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    Demand forecasts made by managers estimate the number & qualifications the firm will need.
    
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    Supply forecasts estimate the availability and qualifications of current workers and those in the labor market.
    

Reliability and validity are both about how well a method measures something: Reliability refers to the consistency of a measure (whether the results can be reproduced under the same conditions). Validity refers to the accuracy of a measure (whether the results really do represent what they are supposed to measure).