In customer research, your primary tools for discovery are your questions, which fall into two main categories: open-ended and closed-ended.
Open-ended questions invite customers to provide a free-form, detailed answer in their own words.
Closed-ended questions restrict customers to a limited set of predefined answers.Open-ended questions are your gateway to exploration. They encourage customers to share their experiences and reasoning in detail, often revealing much more than you thought to ask. Think of them as conversation starters. For example, you might ask:
- Walk me through your experience of contacting our support center.
- Tell me about the last time you used our mobile app.
- What was going through your mind at that moment?
- How did you feel after that interaction?
These questions, even when phrased as commands, prompt storytelling. The first two are classic interview questions designed to elicit narratives about a customer’s journey. The latter two are powerful follow-ups during usability testing or service walkthroughs to capture in-the-moment thoughts and emotions.
Closed-ended questions, in contrast, are designed for precision and clarification. They provide short, specific answers. Examples include:
- What is your current subscription level?
- Have you used our appl before?
- How many times have you contacted support in the last month?
- When was the last time you visited one of our stores?
In a typical research conversation, these two question types work in tandem to build a complete picture. A closed question can establish a fact, while an open-ended question can explore the context behind it.
Closed-ended questions are the backbone of most quantitative surveys because the responses are easily quantifiable and lend themselves to statistical analysis. They typically appear as multiple-choice, rating scale, or checkbox questions. This structure makes it simple for researchers to measure response patterns, such as CSAT or NPS scores.
However, even in a quantitative survey, there are times when a text field for a closed question can improve the customer experience. For questions about personal identity, such as industry or gender, providing an open text field alongside predefined options ensures that everyone can answer accurately and comfortably, without being forced into a category that doesn’t fit.
The primary advantage of closed-ended questions in surveys is that they are quick and easy to answer. A survey filled with demanding open-ended questions often suffers from a high abandonment rate. Use them to gather the essential facts, but be mindful not to over-rely on them.
The real magic of open-ended questions happens in qualitative settings like customer interviews and usability tests. Their greatest strength is their ability to uncover the unexpected. You simply don’t know what you don’t know, and a well-phrased open-ended question gives customers the space to share motivations, behaviors, and concerns you never thought to ask about. When you ask customers to explain their thought processes, they often reveal surprising mental models and problem-solving strategies.
Conversely, a conversation dominated by closed-ended questions will feel more like an interrogation. It will be stilted, surface-level, and unlikely to yield any deep insights. You’ll only get answers to the questions you thought to ask, which severely limits your learning.
One of the biggest risks with closed-ended questions is that they can unintentionally become leading. A leading question suggests a particular answer or reveals your own biases, which can prime the customer to tell you what they think you want to hear. To avoid this, researchers often use a “funnel technique,” starting with broad, open-ended questions before gradually narrowing down to more specific, closed-ended ones.
While not all closed questions are leading, it’s easy to fall into the trap. The table below shows how to rephrase a leading question to be more neutral and open.
A simple trick is to pay attention to how you start your questions. Leading questions often begin with words like “was,” “did,” or “is.” Open-ended questions, on the other hand, frequently start with “how,” “what,” or “why.”
For those new to customer research, leaning on closed-ended questions is a common habit. It can feel more structured to ask a series of factual questions in quick succession. However, a single, broad, open-ended question like, “Tell me a bit about yourself and your relationship with our company,” can often yield all the same information and more, in a much more natural and insightful way.
When preparing for an interview or usability test, challenge yourself to convert your closed questions into open-ended ones. Use the following stems to help you frame your questions:
- “Walk me through…”
- “Tell me about a time when…”
- “Help me understand…”
Finally, don’t forget the power of probing questions. These are spontaneous, open-ended follow-ups that you use to dig deeper into something a customer has just said. Simple phrases like, “Tell me more about that,” or, “What do you mean by that?” can unlock a whole new level of detail.
In your quest to understand your customers, open-ended questions are your tools for discovery, while closed-ended questions are your tools for clarification. Mastering both is essential for a well-rounded CX research practice. Use open-ended questions to uncover rich, unexpected insights that can inspire real change, and use closed-ended questions to gather specific details and measure key metrics. By asking the right questions, you empower your team to move beyond assumptions and build experiences that truly resonate with your customers.
