It can be inferred that this exercise recreation the creation of a recorded speech. Hence the references to diction.
A recorded speech is a speech that is recorded via electronic media for easy playback by the audience.
In this case, it is important to check one's diction so that the listeners of the recorded speech or instructions are not confused about what the author is saying.
Note that the general answer has been given because there is insufficient information to give a specific answer.
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