Your research question should inform the structure and contents of your project and everything you cite should be related to your research question in some way.
This line is the book’s quiet thesis about research writing: the question is not just a starting prompt; it’s the organizing principle. Read “inform” as constrain and shape. If a subsection, paragraph, or citation doesn’t help answer the question you’ve posed, it’s ornamental—cut it. Practically, this means (1) operationalizing your terms (What exactly counts as “psychological well-being”? Which population, time frame, and context?), (2) reverse-outlining your draft to check that every section maps to a sub-task of the question (define, contextualize, test, interpret), and (3) applying a ruthless relevance test to sources: each should either supply evidence, methods, or counter-arguments that bear directly on the claim your question implies. This alignment prevents the two most common failures in student research: the “data dump” (too many unfocused sources) and the “tour” (interesting but aimless background). A strong question automatically yields a coherent structure because it dictates what must be established, measured, compared, or explained—and in what order. Quick check: write your research question atop your draft; under every paragraph, jot the specific part of the question it answers. Anything blank signals a tangent.