There are FOUR phases of Human Resource Management
First Phase:
Administration Management (1940's to 1970's) - focusing on labor welfare
& partly administration.originally called Welfare Secretary.
Second Phase:
Personnel Management (1970's to late 1980's) - focusing on personnel management i.e. punctuality, leaves payroll etc.
Third Phase:
Human Resources Management (Early 1990's till present) - in this era technical revolution replaced manual workers by knowledge workers. Previously labor was treated as a "cost". But now labor is a "resource". When personnel were treated as a cost, they were increased when production increased and were released when production decreased. But treating labor as a resource, one maximizes yield from the resource.
Fourth Phase:
Talent Management - Now, in future the main challenge of an HR Manager would be identifying and retaining the creative people.