Customer interviews and surveys can both inform marketing and product decisions, but they produce different kinds of evidence. Interviews help explore how people describe a problem and why they behave a certain way. Surveys can collect structured responses from a broader set of people. Neither method is automatically representative or unbiased.
en interviews are the better starting point
Use interviews when the problem is poorly understood, language is unclear, or the team needs to explore the steps behind a decision. Open-ended follow-up questions can reveal unexpected context that a fixed response list would miss.
Prepare a neutral discussion guide, recruit people who match the decision context, and record notes consistently. A small interview group can surface themes, but it cannot establish how common those themes are across a market.
en a survey is useful
Use a survey when the team has specific questions and needs comparable responses across a larger group. Structured choices can help estimate how respondents answer, provided the sample and wording are appropriate for the intended population.
Leading questions, missing answer options, low response rates, and self-selection can distort results. A large response count does not guarantee a representative sample or a valid conclusion.
sign around the decision
Write the decision the research should inform before choosing a method. For discovery, interview participants about recent behaviors and concrete examples. For measurement, turn tested concepts into neutral questions with clear response options and a defined sampling plan.
Avoid combining multiple ideas in one question or asking people to predict behavior when a past example is available. Pilot the guide or survey with a few people to catch confusing language.
e the methods together when helpful
Interviews can help discover themes and language; a survey can then check how those themes appear among a broader, deliberately selected group. Survey results can also point to people to interview for deeper context.
Report who was included, what was asked, and what the method can support. Distinguish observed patterns from hypotheses so the research is used at the right level of confidence.
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