Team Building.
What group research says about size, trust and the limits of adding people.
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Adding people to a group does not add proportional output. That has been measured since the 1910s, and organisations still budget as if it does.
What this field actually measures
- Ringelmann effect
Per-person output falling as group size grows.
ReferenceDemonstrated originally in rope-pulling experiments and replicated across coordination tasks.
- Psychological safety
Shared belief that speaking up is safe.
ReferenceMeasured with validated survey scales and repeatedly associated with team learning behaviour.
LimitSurvey measures are vulnerable to exactly the pressure they are measuring.
- Cohesion
Task and social bonding within a squad.
ReferenceMeta-analyses find a modest, reciprocal relationship with performance.
LimitWinning builds cohesion at least as reliably as cohesion builds winning.
Evidence & metrics
The published work behind the numbers above, and the public datasets you can open to check us. If a claim can’t be traced here, we don’t print it.
Citations
Psychological safety and learning behavior in work teams
Edmondson — Administrative Science Quarterly · 1999
Team psychological safety predicted learning behaviour, which in turn predicted team performance.
Evidence for a collective intelligence factor in the performance of human groups
Woolley, Chabris, Pentland, Hashmi & Malone — Science · 2010
Group performance across tasks loaded on a single factor tied to turn-taking equality and social sensitivity, not average IQ.
Datasets
Project Aristotle summary data
Google re:Work · free
Published findings and measures from Google's internal team-effectiveness study.
OSF team performance replication archives
Open Science Framework · free
Open data from group-process and collective-intelligence studies.
Still open
- Which cohesion measures predict rather than reflect results?
- How large can a high-trust unit get before coordination cost dominates?
- What actually transfers from military and aviation team research to sport?
What we won’t say
We will not credit 'chemistry' for a winning streak. The causal arrow has never been established in that direction.
- VO-1Evidence before wit
- VO-2Punch at claims, never at people
- VO-3Say the uncertainty out loud
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