They used the code-name Project Aristotle for their search - a tribute to Aristotle’s quote, "the whole is greater than the sum of its parts". The thesis of the Google researchers was that employees can do more working together than alone.
Teams are highly dependent of their members - they plan work, solve problems, make decisions, and review progress for a specific project. Team members simply need each other to get work done. The researchers at Google found that what really mattered was less about who is on the team, and more about how the team worked together.
The Google research team also wanted to offer tips for improvement and empower Googlers to understand the dynamics of their own teams. They suggested a survey on the five topics for teams to take and they recommended the teams to have a discussion after having received the reports.
Curious to know more on the topic? Check out Amy C. Edmondson, PhD at Harvard Business School. According to her work, starting more than 20 years back, psychological safety is of great importance for organizations with learning, innovation and growth on the top of their agenda.