NPS questions are the questions in a Net Promoter Score survey that measure how likely customers are to recommend your organisation. The core is always the recommendation question on a scale of 0 to 10, supplemented by one or more follow-up questions that explain why someone gives that score. In this article, we answer the most frequently asked questions about NPS questions: from how the questionnaire is structured to common mistakes and translating scores into real improvements.
How does the NPS question work exactly?
The NPS question is a single recommendation question: "How likely is it that you would recommend [organisation] to a friend or colleague?" Respondents answer on a scale of 0 (not at all likely) to 10 (extremely likely). Based on their score, they are divided into three groups: Promoters (9–10), Passives (7–8), and Detractors (0–6).
The Net Promoter Score is calculated by subtracting the percentage of Detractors from the percentage of Promoters. The result is a number between -100 and +100. A positive score means there are more promoters than detractors. But the score itself is only the starting point: it tells you that something is going on, not what or why.
The power of the recommendation question lies in the psychology behind it. Someone only recommends an organisation when the overall experience adds up: from product to service to how a problem was resolved. This makes NPS a summary metric for the entire customer relationship, not just a single moment.
Discover what customers truly care about and give every team clear priorities to improve the customer experience in a focused way.
Discover CX/KTO →What is the difference between the NPS question and the follow-up question?
The NPS question gives you a number; the follow-up question gives you the explanation. Without a follow-up question, you only know that a customer gave a 6, but not why. The follow-up question is an open text field directly after the score question, where the respondent explains in their own words what determined their rating.
A good follow-up question is neutral and open, such as: "What is the most important reason for your score?" or "What could be better?" Avoid leading formulations like "What did you like?", as these only invite positive responses and miss the critical signals.
The combination of score and explanation makes all the difference. A customer who gives a 7 and writes "the technician was friendly but the waiting time was too long" gives you a direct improvement point. This is how you move from measuring customer satisfaction to understanding what lies behind the score, and what you can do to improve the experience.
How many questions should an NPS questionnaire contain?
An NPS questionnaire is most effective with two to a maximum of five questions. The recommendation question and an open follow-up question form the core. Additional questions about specific aspects of the experience, such as waiting time, communication, or the end result, are allowed, but every extra question increases the risk of drop-offs.
Follow this rule of thumb when building your NPS questionnaire:
- Question 1: the recommendation question (scale 0–10)
- Question 2: open follow-up question asking for the reason behind the score
- Question 3 (optional): a closed question about a specific touchpoint or aspect
- Questions 4–5 (only if truly necessary): additional aspect questions or a demographic question
Shorter questionnaires yield higher response rates and therefore more reliable data. A questionnaire that can be completed in under two minutes consistently outperforms a lengthy ten-question survey.
What are common mistakes when writing NPS questions?
The most common mistake is asking multiple questions at once in a single sentence, also known as a "double-barreled question." For example: "How satisfied are you with our service and the price?" A respondent who values the service but finds the price too high does not know which feeling to score. Every aspect deserves its own question.
Other common mistakes when writing NPS questions include:
- Using leading formulations — questions like "How good was our service?" steer the respondent towards a positive answer.
- Not explaining the scale — always make clear what 0 and 10 mean, so everyone uses the same reference point.
- Asking too late — an NPS question sent weeks after a touchpoint yields less reliable answers than one sent immediately after the experience.
- Not adding a follow-up question — a score without explanation is a number without context; you don't know what to do with it.
- Always sending the same questionnaire — customers who receive the same questions every quarter will drop off. Vary the timing and depth of your measurement.
When do you ask NPS questions: relational or transactional?
NPS questions can be used in two ways: relational or transactional. With a relational survey you measure the overall experience of the customer relationship, independent of a specific touchpoint. With a transactional survey you measure directly after an interaction, such as a purchase, a service visit, or a complaint resolution.
Which approach you choose depends on what you want to know. Relational research gives a picture of overall loyalty and is suited for strategic steering. Transactional research provides insight into specific moments in the customer journey and is ideal for operational improvement and rapid follow-up.
In practice, organisations combine both forms. An annual relational measurement gives the big picture; transactional measurements after each relevant touchpoint show exactly where the experience wins or loses. This way you build a complete picture of the customer journey without overwhelming customers with requests.
How do you use NPS questions to actually improve things?
NPS questions only deliver value when you translate the outcomes into concrete actions. That starts with analysing the open answers: what do customers with a low score say, and what distinguishes customers with a high score? By recognising recurring themes, you discover which factors influence the experience most.
An effective approach works in three steps. First, you map out which drivers most strongly determine the score: is it the speed of delivery, the communication, or the quality of the end result? Next, you prioritise the improvement points based on impact and feasibility. Finally, you ensure closed loop follow-up: customers with a low score are actively contacted to discuss and resolve their situation.
Closed loop means that feedback does not just sit in a dashboard, but that a team member takes action. This not only increases the satisfaction of the customer involved, but also shows that your organisation is listening. Customers who were well helped after a poor experience regularly become more loyal than customers who never had a problem.
How CYS Group helps with NPS questions and follow-up
CYS Group helps organisations set up NPS questions in a way that delivers not just a score, but also a story. With our own 3-question methodology and driver model, we map out which factors most strongly determine the experience — without complex statistics. So you know not only that your NPS is low, but also why and where to start improving first.
What we concretely do:
- Design questionnaires that are short, valid, and focused on the right moments in the customer journey
- Conduct driver analysis to see which aspects most strongly influence the NPS score
- Set up closed loop follow-up so that dissatisfied customers are contacted quickly and personally
- Build dashboards in the platform cx.management that directly steer teams towards improvement
- Support prioritisation through the Priority Matrix: what has the greatest impact and is most feasible?
Want to know how your organisation can move from measuring NPS to improving NPS? Get in touch with CYS Group and discover what our approach can mean for your customer experience.
Make every experience count.
Frequently Asked Questions
What is a good NPS score and how do I know if my score is high enough?
A 'good' NPS score varies significantly by sector. In healthcare, a score of +50 is considered excellent, while in the telecom sector +20 may already be strong. Always compare your score against a sector-specific benchmark rather than a general average. More important than the absolute score is the trend: if your NPS is rising quarter over quarter, you are on the right track, regardless of where you stand today.
How often should I send NPS questions to collect reliable data without overwhelming customers?
For transactional measurements, send the questionnaire as soon as possible after the touchpoint, preferably within 24 hours. For relational measurements, once or twice a year is sufficient. Also maintain a minimum interval of 90 days per individual customer, so the same person does not receive a request too frequently. Too high a measurement frequency leads to survey fatigue and lower response rates.
What should I do if my response rate on the NPS questionnaire is too low?
A response rate below 15–20% is a signal to shorten the questionnaire, reconsider the send timing, or switch the channel. Send the invitation via the channel the customer is used to, such as email, SMS, or an in-app notification, and use a personal greeting rather than a generic message. A short, clear subject line such as 'One question about your experience' significantly increases the open rate.
Can I also use NPS questions for internal customers or employees?
Yes, the NPS methodology can also be applied to internal customer relationships, for example to measure how satisfied colleagues are with an internal service department such as IT, HR, or facilities. This is also known as eNPS (employee NPS) or internal NPS. The structure of the questionnaire remains the same, but the recommendation question is adapted to an internal context, such as: 'How likely is it that you would recommend our department to a colleague in another business unit?'
How do I deal with customers who consistently give a low NPS score, regardless of what I improve?
Some customers are structural detractors due to a fundamental mismatch between their expectations and what your organisation offers. First analyse whether there is a pattern in the profiles of these customers: does it involve a specific segment, a particular product, or a certain region? If closed loop follow-up and targeted improvements have no effect, it is worth evaluating whether this customer group actually fits your proposition. Not every detractor is a customer you can or should convert into a promoter.
Which tools or platforms can I use to send NPS questions and analyse the results?
There are various platforms available, ranging from generic survey tools such as SurveyMonkey and Typeform to specialised CX platforms such as Medallia, Qualtrics, and the cx.management platform used by CYS Group. The choice depends on your scale, the desired integrations with your CRM or service platform, and whether you want to automate closed loop follow-up. Specialised CX tools generally offer more capabilities for driver analysis and real-time dashboards than generic survey tools.
How do I present NPS results convincingly to management or the board?
Always present NPS results in combination with context: the trend over time, a sector comparison, and the key drivers behind the score. Link the NPS data to business outcomes, such as customer retention, revenue per customer, or churn rate, to underline the business relevance. Executives respond better to a story than to a number, so use quotes from the open answers to bring the score to life and make clear which concrete actions have already been taken or are planned.
