Knowing how to elaborate and support opinions, reasons, and explanations is critical for conversational literacy. In addition, competencies achieved in face-to-face interactions may transfer to the written domain where providing supportive information is always necessary.
Here are a variety of responses to the question "What is your major and why did you pick it?"
In this example the student follows her reasons for choosing a major with a comment about switching to social work at a later time. She does not explain why she wants to make the change and leaves the conversational partner wondering if business is what she wants.