Petronio sees communication privacy management theory (CPM) as a map of the way people navigate privacy. She wants us to think of privacy boundaries that encompass information we have but others don’t know. Privacy boundaries can range from thin and porous filters to thick, impenetrable barriers that shield deep, dark secrets. But whenever we share a portion of that information with someone, we are reshaping a privacy boundary. Having a mental image of protective boundaries is central to understanding the five core principles of Petronio’s CPM