The Ringelmann effect refers to the systematic reduction of individual effort on a task as the number of people performing that task increases. Originally identified by French agricultural engineer Maximilien Ringelmann during the 1880s and published in 1913, this phenomenon demonstrates that while a group’s collective output increases with size, per-person productivity progressively declines. For example, early accounts showed that while individuals perform at 100% capacity alone, members of a two-person group pull at 93% capacity, and members of an eight-person group drop to just 49% of their individual ability.

Coordination vs. Motivation Loss

Ringelmann initially attributed these performance declines to poor social coordination, such as group members failing to synchronize their physical efforts (e.g., not pulling a rope at the exact same time or angle). Over time, researchers began investigating whether this drop in performance was purely a physical coordination issue or if it also involved motivation loss, a phenomenon later popularized as social loafing.

The Ingham Replication and Steiner’s Model

In 1974, Alan Ingham and his colleagues conducted a rigorous replication of Ringelmann’s work, drawing on Ivan Steiner’s theory of group productivity. Steiner proposed that actual group productivity is potential productivity minus losses due to faulty processes, categorizing these as coordination losses and motivation losses. Ingham’s controlled laboratory experiments confirmed the Ringelmann effect, finding performance decrements of 9% in two-person groups and 18% in three-person groups, though additional losses leveled off in groups of four to six members.

Mentoring question

How can you structure your team’s projects and individual responsibilities to minimize both coordination and motivation losses as your team size grows?

Source: https://sk.sagepub.com/ency/edvol/processes/chpt/ringelmann-effect#_