Oddly Wired
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social dynamics

You exert less effort when you work in a group.

The term 'social loafing' was coined and established by Latané, Williams, and Harkins in 1979.

Ingham et al. (1974) published 'The Ringelmann Effect: Studies of Group Size and Group Performance,' which experimentally confirmed that groups exert less individual effort than individuals working alone, a phenomenon the authors termed the 'Ringelmann effect'.

Responsibility is often diluted in the presence of others.

Where this comes from

Study
Ingham et al. (1974)
What the check found
The definition is correct, but the attribution of the term 'social loafing' to Ingham et al. (1974) is inaccurate; they studied the Ringelmann effect.
Confidence
Solid, with limits
social dynamicsbehaviourgroup psychology

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.