Communication experts love to tell people to know their audience, but it is not always clear what they’re meant to know.
Knowing someone’s age, education and gender are nice. So too is knowing context about the economic, educational, cultural and ideological background. These are typically what the two of us here when we’ve asked science communication trainers what they think the expression means.
Knowing such things are helpful, but there’s a lot more a strategic communicator might want to know.