Four factors that should be considered when selecting a channel of communication to use:

1. Audience: Consider the preferences and needs of the audience you are trying to reach. Different channels may be more effective for different demographics or groups of people.

2. Message: The type of message you are trying to convey can also influence the choice of communication channel. For example, a complex or detailed message may be better suited for a written communication channel like email, while a simple announcement may be more effectively communicated through a verbal channel like a meeting or phone call.

3. Urgency: If the message is time-sensitive or requires immediate action, a real-time communication channel like a phone call or instant messaging may be more appropriate than a slower channel like email.

4. Resources: Consider the resources available to you, such as time, budget, and technology. Choose a communication channel that is feasible and practical given the resources you have at your disposal.

1. Audience: Consider the target audience for your message. Their demographics, interests, and media consumption habits will influence which channels are most effective.
2. Message: The nature of your message will also impact channel selection. Some channels are better suited for short, urgent messages, while others are more effective for longer, in-depth communication.
3. Budget: The cost of using a particular channel should be factored into your decision. Some channels, such as email, are relatively inexpensive to use, while others, such as television advertising, can be more costly.
4. Timeline: The timeliness of your message will also influence your channel selection. If you need to reach your audience quickly, you will need to choose a channel that can deliver your message quickly.