If two Scrum Teams join an existing product development, what impact might this have on the original Scrum Team’s productivity?

When two new Scrum Teams are introduced to a product already being developed by an existing Scrum Team, the dynamics of collaboration, communication, and coordination can significantly change. The addition of new teams often leads to an increase in interactions required between teams. This heightened level of inter-team communication can disrupt established workflows and introduce complexities that may impede the existing team's productivity.

For example, coordination efforts to align on shared goals, interface definitions, and integration points can create additional overhead. Teams may need to spend time in meetings or synchronization sessions to ensure alignment and avoid misunderstandings. Additionally, as multiple teams begin to work in tandem, dependency management becomes more critical and can further challenge efficiency if not addressed effectively.

Thus, while the potential exists for scaled productivity over time as the teams learn to work together, the immediate effect of introducing new teams often results in decreased productivity for the original Scrum Team as they adapt to the new collaborative environment. This understanding is rooted in the principles of Scrum where the focus on teamwork and communication directly impacts the team's efficiency in delivering valuable increments of work.