I experience how important clear messages are in any form of communication. Direct messages informing what I want and need (needs, interests, and positions) and listening to what the other person wants and needs is crucial. Clear expectations shared by both parties that can be accomplished by setting up the clear boundaries at the beginning of a conversation (time, place, focused topics) can prevent any possible miscommunication and misunderstanding that can occur. Lastly, understanding what the context is and where they stand in the context is another important aspect of communication factors.
The following are some of the examples of unhealthy communication killers with which mutual understanding can be hardly fostered: Shutting down, dismissing the other person verbally and nonverbally, not listening to what the other person wants and needs (ignoring/not responding to them at all/redirecting the other person to my own agendas), sharing unwanted advice, dominating the talk by appealing my point of view to the other person, and so on.
Communication flexibility seems to be the most valuable quality that a workplace communicator can develop in order to become more competent in diverse communicational situations with communicators with new communication styles.