Explain which situations are best for written communication and which for oral communication, and why each is best for those situations.

A written message makes it easier to do the following:
Present extensive or complex data.
Present many specific details.
Minimize undesirable emotions.
Track details and agreements.
Oral messages make it easier to do the following:
Use emotion to help persuade the audience.
Focus the audience's attention on specific points.
Resolve conflicts and build consensus.
Modify plans.
Get immediate action or response.