Good vs Bad Survey Questions

My research topic is: The Impact of Grammarly Tool on Writing Accuracy for EFL Learners at Private English Center in Bac Lieu

• Well-written survey question: On a scale from 1 (Strongly Disagree) to 5 (Strongly Agree), Grammarly helps me reduce grammar mistakes in my writing.
• Poorly constructed survey question: Do you think Grammarly is useful and better than teacher feedback for improving your writing?

--> The well-written question is specific, uses a clear Likert scale, and measures one variable at a time.

---> The poorly constructed question is problematic because it combines two ideas (“useful” and “better than teacher feedback”), which makes it double-barreled. It also lacks a clear scale, so responses would be inconsistent and hard to analyze.