what are the three viewpoints of the contemporary perspective of management?
['Peter Drucker. the creator and inventor of modern management.', 'Historical perspective. includes three viewpoints- classical, behavioral, and quantitative.', 'Contemporary perspective. ... ', 'Classical Viewpoint. ... ', 'Behavioral Viewpoint. ... ', 'Quantitative Viewpoint. ... ', 'Systems Viewpoint. ... ', 'The Contingency Viewpoint.']