Question: what are the principles of effective interpersonal communication?
Answer: That we treat each other with respect. ... 
That we do not interrupt one another. ... 
That we have the right to pass. ... 
That we do not volunteer others. ... 
That we speak only for ourselves (We speak in the 'I' - often called using 'I' statements) ... 
That we speak but not too often or for too long.