Many people consider this to mean speaking clearly, logically and concisely and beware of using idioms and slang. True, these factors are important. But there is more. This approach enables you to effectively identify and reconcile any misunderstandings or conflicts caused by different communication styles. People adopt different communication styles as a result of their upbringing, education, age, gender, experience, etc.
Some people speak very fast while others talk at a measured pace.
You could find the first group of communicators at public auctions and the second group at diplomatic functions. Also, some people speak with hand movements while others display great physical restraints. The answer depends on the situation. Quite often, people reject incoming messages outright because the sender communicates differently. The result is a complete breakdown in communication, damaging working and business relationships.