What distinguishes groups from teams in terms of characteristics, tasks, cohesion, performance accountability and other important aspects.

What distinguishes groups from teams in terms of characteristics, tasks, cohesion, performance accountability and other important aspects. Do you think the different theories of leadership and team building can be used by the leaders to build a good team for superior performance using these theories and models? Please discuss the different leadership such as situational, contingency and many others.
Minimum 2000 words and must have at least 12 quality references with LINKS.

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