Final answer:
The three most important pieces of information to include when taking a routine telephone message are the caller's name, phone number, and reason for the call.
Step-by-step explanation:
The three most important pieces of information to include when taking a routine telephone message are:
- The caller's name: This helps to identify the person who called and is essential for any callbacks or follow-ups.
- The caller's phone number: This allows you to reach out to the caller if needed and is crucial for maintaining communication.
- The reason for the call: Understanding the purpose of the call helps in prioritizing and addressing the caller's needs effectively.