Measurement is the only way to know if something is working or not. Just like we use a thermometer to measure our temperature when we are sick, we need a way to measure if our team is performing and communicating better. This is often overlooked. Companies spend lots of money trying to improve these without a way of knowing that it worked or not. Even a subjective measurement or survey is better than nothing.
The difficult part about metrics is finding out what to measure and how to measure it.