Suggest advantages and disadvantages of using letters for communication.

Pros: If you have any document in written then you can easily preserve it, while on the other hand non-verbal communication doesn't have any proof as they cannot be preserved. You can easily access to written communication in future.
Cons: Written communication is time-consuming as the feedback is not immediate. The encoding and sending of message takes time. Effective written communication requires great skills and competencies in language and vocabulary use. Poor writing skills and quality have a negative impact on organization's reputation.

Nation of conflicting ethnic groups