Written:
1. Text Messages: texting can often seem impersonal and since it is done quickly there can be errors. To avoid offending people, only send text messages when it's really necessary or when you're being very informal.
2. Letters: letters can be a good, thoughtful, and personal way to communicate with someone, but if you have illegible handwriting or if speed is of the essence you might want to consider a different form of communicating.
3. E-mails: E-mails can also seem impersonal and rushed, this can lead to misinterpretation and possible affront. When writing an E-mail you should take your time (if possible) and use your spell checker.

Verbal:
1. Over the phone conversations: When talking on the phone it is easy to get distracted and stop listening, also depending on your phone service and location the sound quality can be compromised. Phone conversations can be very useful as long as you use proper phone etiquette as well as good judgment as to whether the conversation should take place in person or not.
2. In person conversations: Well if you have a bad case of halitosis, in person conversations might not be for you; physical appearances can be distracting as well. When you know you're going to be having an important personal conversation you should definitely mind your appearance and you should always keep good dental hygiene, as well as all the other sorts of hygiene.
3. Speeches: Speech making can be daunting to many individuals, there is and added pressure to speak well and not make mistakes. If you make a mistake while making a speech there is a larger audience and your mistake may be hard to recover from. If you know you're going to make a speech you should be well prepared; have note cards in case you get stuck and rehearse your speech with a friend and ask for their opinions. Trying to relax and not making such a big deal of the event might help as well.

Non-verbal:
1. Facial Expressions:
2. Body language/demeanor
3. Hand gestures