Which guideline is being followed when providing specific details about a subject?

Providing specific details about a subject adheres to the guideline of being concrete. When communication is concrete, it focuses on clear, tangible, and specific information that helps the audience understand the message more effectively. This includes using precise language, examples, and details that paint a vivid picture, allowing listeners to grasp complex concepts and ideas.

In public speaking, being concrete enhances the engagement of the audience, as they can relate to specific examples and visualize what is being discussed. For instance, when discussing a product, mentioning its features, dimensions, and benefits creates a clearer understanding compared to merely stating general opinions about it.

The other guidelines highlighted do not support the same clarity or specificity. Being abstract would involve using generalizations that might lead to confusion. Employing repetition might emphasize a point or idea but does not inherently provide clarity. Lastly, being vague leaves much to interpretation and could ultimately disengage the audience, making it difficult for them to follow the speaker's intent.