When there's a team of people who work collaboratively on Puppet, it is important to have good communication among its members, a common vision on how the code is organized, where logic and data are placed, and what the principles behind some design decisions are.
Many mistakes made while working on Puppet are due to incomplete knowledge of the area of effect of code changes, and this is generally due to bad communication.
For this reason, any tool that can boost communication, peer review, and discussion about code can definitely help in having a saner development environment.
When we work with Git, the natural companion to manage peer review and workflow authorization schemes is Gerrit. This is a web interface made by Google for ...