Do not anger or embarrass the person. Must learn to control your anxiety. Silence , however, in the middle of a confrontation can be interpreted as acceptance. Standing up for one's own rights without violating the rights of others. Know the difference between assertive and aggressive.
Effective communication is enhanced by clear, direct, straightforward, and frequent messages.
Trust, respect and empathy are needed to create and maintain effective communication. Success requires the ability to relate a compelling image. A leader's role is to communicate a vision. Also see Zerwekh-pp. Stalls problem solving.