The term "team building" covers an enormous range of activities, from escape rooms and cooking classes to structured facilitated workshops and sustained capability development programmes. The evidence on which of these actually improves team performance is considerably more specific than the industry around them would suggest.
The good news is that the research is clear. The conditions that create high-performing teams are well understood. The development activities that reliably build those conditions are also well understood. The challenge is that the conditions that actually matter are harder to build than booking an activity day, and organisations sometimes substitute the easier option for the more effective one.
What Actually Makes a Team High-Performing
Google's Project Aristotle, published in 2016, studied hundreds of teams across the organisation to identify what distinguished high performers from low performers. The findings were counterintuitive. The composition of the team, who was on it in terms of skills and experience, mattered less than expected. The internal dynamics of the team mattered enormously.
The single strongest predictor of team performance was psychological safety: the shared belief among team members that the team is safe to take interpersonal risks. Teams where members felt they could speak up, share concerns, admit mistakes, and offer ideas without fear of ridicule or punishment dramatically outperformed teams where they did not.
Subsequent research by Edmondson (1999, 2023) has confirmed and extended this finding. Teams with high psychological safety learn faster, innovate more, recover from mistakes more effectively, and retain members at higher rates. The mechanism is straightforward: information that needs to be shared gets shared; problems that need to be surfaced get surfaced; ideas that need to be tested get tested.
The other conditions that consistently predict team effectiveness include: clarity of goals and individual roles; appropriate processes and tools; a supportive organisational context; and a leader who actively manages the team's internal dynamics. Psychological safety is the foundational condition on which the others depend.
Why Most Team Building Falls Short
Most team-building activities address the symptom (low cohesion or low morale) rather than the underlying condition (insufficient trust, unclear roles, or poor communication norms). A team that has low psychological safety will have a pleasant time at an escape room and return to the same dynamics on Monday morning because nothing that creates psychological safety has occurred.
Trust, the foundation of team effectiveness according to Lencioni's research, is built through vulnerability: specifically, through leaders and team members demonstrating genuine openness about their limitations, mistakes, and areas of uncertainty. An activity that does not create the conditions for this kind of vulnerability does not build the kind of trust that translates into team performance.
This does not mean experiential activities have no value. They can be genuinely useful as conversation starters, as shared experiences that create relational warmth, and as contexts where people see each other differently. The limitation is that these benefits are fragile without the structural and behavioural conditions that sustain them.
Team Building That Has Strong Evidence
Several types of team development have consistent evidence of effectiveness.
Facilitated team diagnostics. A structured process where the team examines its own functioning, identifies strengths and development areas, and agrees on specific changes to how it operates is one of the highest-return team development investments available. The diagnostic creates shared awareness of team dynamics that is often uncomfortable but genuinely actionable. Teams that have done this work have a shared language for what they are building toward and shared accountability for building it.
Leader-modelled vulnerability. The most powerful thing a leader can do to build psychological safety is model it themselves: admitting uncertainty, acknowledging mistakes openly, asking for help, and treating challenge and disagreement as valuable rather than threatening. This is not a workshop intervention. It is a leadership practice that either builds or erodes psychological safety through every interaction over time.
Working agreements. Many team dysfunction patterns stem from unspoken norms that no one has ever examined or agreed to. A facilitated conversation that produces explicit working agreements, about how the team makes decisions, how it handles disagreement, how it manages workload peaks, and how it raises concerns, creates a framework that new team members can be inducted into and that existing members can reference when norms are violated.
Regular team retrospectives. A structured monthly or quarterly conversation where the team reflects on what is working, what is not, and what it will do differently is one of the most effective ongoing team development practices. It normalises the conversation about team dynamics, creates shared accountability for improvement, and builds the habit of collective learning that high-performing teams depend on.
Individual strengths alignment. Teams where each member understands their own strengths and those of their colleagues, and where work is allocated with attention to how those strengths can be best utilised, outperform teams where this mapping has not been done. This is not complex to implement, but it does require a facilitated conversation and a shared framework.
Building Team Performance Over Time
The most important insight about team building is that it is not an event but a sustained practice. The away day is a useful accelerant, not a substitute for the ongoing work of leading a team.
The leaders whose teams consistently perform well are those who attend to team dynamics as a regular part of their leadership practice: who notice when psychological safety is declining and address it, who ensure clarity of goals and roles as context changes, who create regular retrospective space, and who model the vulnerability that makes genuine team effectiveness possible.
This kind of sustained attention to team health is what distinguishes teams that maintain high performance from teams that have occasional high-performance moments interspersed with dysfunction.
Try This
In your next team meeting, use the last 10 minutes for a brief retrospective. Ask three questions: What is working well in how we are operating as a team? What is getting in the way? What one thing could we change or try differently in the next four weeks? Listen to the answers without defending the current state. This is the starting point of a team performance conversation.
References
Duhigg, C. (2016) 'What Google learned from its quest to build the perfect team', The New York Times Magazine, 25 February.
Edmondson, A.C. (1999) 'Psychological safety and learning behaviour in work teams', Administrative Science Quarterly, 44(2), pp. 350--383.
Edmondson, A.C. (2023) Right Kind of Wrong: The Science of Failing Well. London: Atria/One Signal Publishers.
Lencioni, P. (2002) The Five Dysfunctions of a Team: A Leadership Fable. San Francisco: Jossey-Bass.
Wageman, R. et al. (2008) Senior Leadership Teams: What It Takes to Make Them Great. Boston, MA: Harvard Business School Press.