HOW?
Make a list of key points to discuss before speaking to parents.
Stop a discussion with a parent when you feel you are starting to become too angry, frustrated, agitated, etc to remain professional and appropriate.
Speak in plain language and avoid wordy or difficult to understand language
Set expectations, limits, and rules for discussion when you feel they have a high likelihood of becoming long, drawn out, hostile, tense, contentious, etcProvide parents with examples of whatever you are talking about with them regarding the student, like work samples, pictures, behavior logs and data tracking, etc