Answer :
To ask for letters of recommendation from three different people, being your uncle, your teacher and the director of your summer internship, some modes and channels of communication could be more useful and aligned with the type of relationship you have with each person.
The means of communication used with your uncle could be a telephone call with informal communication. With a teacher, you could make the request through face-to-face communication in a formal tone, as you have more access to your teacher during class.
With the director of your summer internship, the appropriate channel of communication could be email, using a formal tone, as this is an entirely professional relationship.
How to choose the ideal communication channel?
There are different communication channels, such as email, telephone and meetings, and the most effective will be the one aligned with the purpose of your communication and the recipient of the message.
Therefore, the use of the ideal communication channel will have relevance in the transmission of your message, which must be delivered objectively and without communication noise.
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