Start From the Decision, Not the Questionnaire
The most common way to weaken a study is to pick the instrument first. Begin with the business decision the research has to inform, and let that choose the method.Define the decision first, then design backward. The question picks the method; the method should never pick the question.
Define the question first
Before any method enters the conversation, write down the decision the research exists to inform and what result would actually change it. If you cannot say what you would do differently depending on the answer, you are not ready to design the study — you are ready to keep thinking about the question.
Let the question pick the method
Only once the decision is clear can you choose well. Some questions live in fast, automatic processing and need a reaction-time or implicit read; some are genuinely about stated intent and belong in a survey; most are best served by both. The method is a consequence of the question, not a starting preference you bend the question to fit.
Design backward from the insight
Picture the chart you would need to make the decision, then work backward to the stimulus and the sample that would produce it. Question, design, field, insight — kept in that order, the study stays pointed at the decision the whole way through, instead of arriving at a tidy dataset that answers a question nobody needed settled.