Why NPS and employee satisfaction surveys no longer work - and what...

Why NPS and employee satisfaction surveys no longer work - and what does

By Kim Cramer, PhD & Alexander Koene | BR-ND People | Creative change agency

In this article

• What is the Net Promoter Score and why is it under scrutiny?
• Why does the annual employee satisfaction survey fall short?
• What alternatives exist for keeping a continuous pulse on your people?
• How do emotive measurement techniques like 23plusone work?
• What do you actually want to know about your employees?
• What is the relationship between positive culture and business performance?
• How do you start measuring what matters?
• From sentiment to identity: the future of measurement
• Frequently asked questions

What is the Net Promoter Score and why is it so popular?

The Net Promoter Score (NPS) is a metric that measures how likely someone is to recommend your organisation to a friend or colleague. It was introduced in 2003 by Fred Reichheld in a now-famous Harvard Business Review article with the tantalising title 'The One Number You Need to Grow'.

The promise was irresistible: one question, one number, and you know where you stand. Respondents score from 0 to 10, after which they are categorised into three groups: promoters (9-10), passives (7-8) and detractors (0-6). The difference between the percentage of promoters and detractors is your NPS. Simple. Elegant. And therein lies the problem.

NPS became wildly popular. Not because it's the best metric, but because it's the easiest. In a world that loves dashboards and KPIs, NPS was a gift: one number you can put on a slide in a board meeting. No nuance needed. No context required. Just a number.

That sounds like talking about the weather: 'It's 7 degrees.' Yes, but where? And is it windy? And is it raining? In other words: the number alone tells you almost nothing.

What's wrong with NPS? The scientific critique

NPS is not the reliable predictor of growth that Reichheld promised. That's not an opinion. It's the conclusion of multiple peer-reviewed studies.

Keiningham, Cooil, Andreassen and Aksoy (2007) published one of the most cited critiques in the Journal of Marketing. Their finding: NPS is no better a predictor of business growth than other customer satisfaction metrics. The claim that it's 'the only number you need' proved scientifically untenable.

De Haan, Verhoef and Wiesel (2015) examined the predictive value of NPS versus other metrics in the Journal of the Academy of Marketing Science. Their conclusion: NPS performs no better than alternatives such as ACSI (American Customer Satisfaction Index) or top-2-box satisfaction scores at predicting revenue growth.

Gartner predicted in 2021 that more than 75% of organisations would abandon NPS by 2025. That prediction proved too optimistic. Not because NPS works better than thought, but because organisations struggle to let go of a metric that's so conveniently simple. The power of habit is stronger than the power of evidence. Sound familiar?

The mathematics of loss

The NPS calculation - the percentage of Promoters minus the percentage of Detractors - ignores the entire group of Passives. That sounds like a detail, but it leads to absurd situations. An organisation with 40% Promoters and 60% Detractors scores -20. An organisation with 10% Promoters, 60% Passives and 30% Detractors also scores -20. The same score, but the cultural dynamics are worlds apart. The first organisation has a polarised climate, the second an apathetic middle group that could be relatively easily moved toward a positive sentiment with the right intervention. NPS makes no distinction. That's like saying two patients are equally ill because they both have a fever, when one has the flu and the other has malaria.

Seven fundamental limitations of NPS

1. It reduces complexity to a single number - a customer or employee relationship is multidimensional. One number can never capture that.
2. The categorisation is arbitrary - why is a 6 a 'detractor' and a 7 a 'passive'? That distinction has no empirical basis. An employee who gives a 6 and one who gives a 0 are lumped into the same category. That's like treating someone who's mildly disappointed and someone who's actively sabotaging your company as equals.
3. Intention is not behaviour - the question measures whether someone would recommend, not whether they actually do. As every psychologist knows: what people say they'll do and what they actually do are two different things.
4. It explains nothing - NPS tells you that something is going on, but not what. You know you score 23, but you don't know why. And without 'why', you can't improve anything.
5. Survivorship bias - when dissatisfied customers or employees leave, your NPS rises. Not because you've improved, but because the critics are gone. You're celebrating an improvement that doesn't exist.
6. Cultural distortion - in some cultures, nobody gives a 9 or 10 (that would be arrogant), while in others anything below an 8 is considered insulting. International comparisons are therefore unreliable.
7. Perverse incentives and score-gaming - in many organisations, bonuses are tied to NPS. This leads to 'score-gaming': employees begging customers or colleagues to give a 9 or 10, causing the validity of the measurement to evaporate entirely. You're no longer measuring what people think, but how skilled your employees are at social pleading.

Why is the annual employee satisfaction survey no longer fit for purpose?

The classic employee satisfaction survey is the organisational equivalent of an annual medical check-up: it tells you how things were a year ago, not how they are now. And as any doctor will confirm: if you only measure once a year, you miss everything in between.

The traditional employee satisfaction survey has several structural problems:

It's too slow

In a world where markets and sentiments can shift within weeks, a twelve-month feedback cycle is fatal. A problem that arises in January is only measured in November and discussed in February the following year. By then, talented employees may have already left, or the cause of the dissatisfaction may no longer be relevant. It's like using last month's weather forecast to decide whether to wear a jacket today. This lack of responsiveness undermines employees' trust in the organisation's ability to listen. (Read also: Change communication that works: from resistance to ownership on how to build trust during change.)

It measures the wrong things

Most satisfaction surveys focus on 'satisfaction'. But satisfaction is just one layer in the pyramid of human experience. You can be perfectly satisfied with your desk chair and completely demotivated at the same time. Satisfaction tells you nothing about engagement, meaning, ownership, or the willingness to go the extra mile.

Gallup's State of the Global Workplace report (2025) shows that globally only 23% of employees are genuinely engaged at work. Low engagement costs the global economy an estimated $8.9 trillion in lost productivity per year. Measuring satisfaction when engagement is the problem is like checking the tyre pressure while the engine is on fire.

It creates survey fatigue and cognitive overload

Annual surveys are notorious for their length, often ranging from 50 to 100 questions. Employees who must answer the same 80 questions every year develop a predictable response: they fill it in as quickly as possible, give socially desirable answers, or simply opt out. This cognitive overload contaminates the data. Moreover, a one-off measurement is extremely sensitive to recent events - the so-called peak-end rule. One bad week just before the survey can unfairly influence the entire annual score. Response rates drop, data quality drops, and the entire instrument loses its value.

It rarely leads to change

This is perhaps the deadliest critique: most satisfaction surveys don't lead to noticeable improvement. Employees fill it in, hear something about it months later, and then see little change. The result? Cynicism. 'Oh, is it survey time again? We said everything last year too and nothing happened.' That cynicism isn't unreasonable. It's the logical response to a pattern.

What alternatives exist for keeping a continuous pulse?

If the annual satisfaction survey is an X-ray, pulse surveys are a continuous heart rate monitor. Pulse surveys are short, frequent questionnaires (5 to 15 questions) administered weekly, fortnightly, or monthly.

Gallup, one of the most cited sources on employee engagement, recommends short, regular measurements as a complement to annual engagement surveys. Their research shows that organisations that measure frequently and act quickly achieve significantly higher engagement scores.

The advantages of pulse surveys are clear:

1. Speed - results are available within days, not months
2. Relevance - you measure what's happening now, not what was happening three months ago
3. Lower barrier - completing 5 questions takes 2 minutes. Completing 80 questions takes motivation.
4. Trend insights - by measuring frequently, you see patterns over time. Not one photo, but a film.
5. Faster action - if you measure quickly, you can adjust quickly. The feedback loop becomes shorter.

But pulse surveys aren't a silver bullet. They still primarily measure opinions - what people say they think. And opinions, as we know, aren't always a reliable reflection of what's really going on. People are remarkably skilled at giving socially desirable answers, especially when anonymity doesn't feel guaranteed.

Although pulse surveys are superior for operational agility, many experts advocate a hybrid model: an in-depth annual survey reveals the structural foundations, while frequent pulses monitor the daily dynamics. But the real breakthrough isn't in asking questions more often. It's in asking questions differently.

How do emotive measurement techniques work, and why are they more effective?

Emotive measurement techniques don't measure what people say they think - they measure what they unconsciously feel. That sounds abstract, but it's based on solid scientific foundations.

Psychology has long distinguished between two systems of thinking, popularised by Nobel laureate Daniel Kahneman (2011) as System 1 (fast, intuitive, emotional) and System 2 (slow, rational, deliberate). (More on how System 1 works in brand decisions: Why B2B buyers decide with emotion.) Most surveys address System 2: they ask people to think, rationalise, and assign a number to their experience. But most human behaviour is driven by System 1 - by emotions, intuitions, and unconscious associations.

That's why an employee can give a 7 on a satisfaction survey while browsing LinkedIn for a new job that same evening. The rational answer ('it's fine here') doesn't match the emotional signal ('I no longer feel at home here').

The 23plusone method: measuring what drives people

The 23plusone method was developed as a scientifically grounded way to uncover people's deeper drives. The method is included in the standard reference work Brand Management Models: The SWOCC Selection by the Foundation for Scientific Research in Commercial Communication (SWOCC), affiliated with the University of Amsterdam.

How does it work? The method is the result of extensive interdisciplinary research - philosophy, psychology, sociology and neurology - into what truly makes people happy and what makes brands attractive. The model identifies 24 universal human drives: 23 positive drives and one negative ('escapism') that serves as a warning signal.

These drives are clustered across five domains that touch the core of human experience at work:

1. Basics - the fundamental needs for safety, security, order and care. Without this foundation, no culture is stable.
2. Vitality - focused on health, physical wellbeing and energy. This has a direct impact on absenteeism and resilience.
3. Attraction - the need for aesthetics, sensuality and connection. This domain explains why employees take pride in the visual identity of their brand.
4. Self-development - the intrinsic drive to learn, create and express one's unique potential.
5. Ambition - the motivation to achieve, acquire status and gain recognition.

Instead of asking rational questions, 23plusone uses so-called 'drivograms': cards with carefully selected images and words that directly engage the emotional centres of the brain. Respondents react under mild time pressure with 'yes' or 'no' to these visual stimuli. The time pressure is essential: it prevents people from rationalising and activates the fast, intuitive system.

Instead of asking 'How satisfied are you?', the method asks: 'Which emotional values do you currently experience in this culture, and which would you like to experience?' The result is an emotional profile that reveals what a person - or a group - truly cares about. This approach makes the invisible - the culture - tangible. It enables organisations to define a 'Brand Heart': a concise representation of the shared values that connect strategy, communication and behaviour in the workplace.

The 23plusone Happiness Scan is the digital version of this method: a short, self-guided experience that provides a snapshot of the drives currently influencing someone's motivation and wellbeing.

Why emotive techniques work better

1. They bypass socially desirable answers - by working with images and time pressure, you measure what someone intuitively feels, not what they think the right answer is.
2. They're universal - visual stimuli work cross-culturally. Where language and scales differ between cultures, emotional reactions to images are more universal.
3. They measure deeper layers - not satisfaction but drivers. Not 'how do you like it here?' but 'what makes you happy and do you recognise that here?'
4. They generate conversation - the profile is not a final verdict but a starting point for dialogue. This makes the instrument not only diagnostic but also interventionist.

What do you actually want to know about your employees?

If the people are the brand, the question isn't just 'are they satisfied?' but 'do they stand for the same things?' That's a fundamentally different question from what most organisations ask.

Let's be honest: most employee surveys measure hygiene factors. Is the canteen good? Are the meeting rooms available? Does the IT department function? These are relevant questions, but they don't touch the core. The core lies in deeper layers. (See also: Translating core values into concrete workplace behavior for 13 proven approaches.)

Meaning and purpose

Research by Steger, Dik and Duffy (2012) in the Journal of Positive Psychology shows that employees who experience meaning in their work report significantly higher engagement and lower intention to leave. Meaning isn't a luxury; it's a predictor of retention and performance.

Psychological safety

Amy Edmondson (Harvard Business School) defined psychological safety as the shared belief that it's safe to take interpersonal risks within a team. Her research, spanning three decades, consistently shows that psychological safety is the strongest predictor of team effectiveness. Google's Project Aristotle (2015) confirmed this: of all the factors determining team performance, psychological safety was by far the most important.

BCG (2024) published that psychological safety functions as a 'levelling force': it enables employees from all backgrounds and levels to unlock their potential.

Ownership and autonomy

Deci and Ryan's self-determination theory (2000) demonstrates that autonomy is one of three basic psychological needs. Employees who feel ownership over their work perform better, are more creative, and stay longer. Psychological ownership (Pierce, Kostova & Dirks, 2001) reinforces this: the feeling that something is 'mine' makes people invest more in it.

Pride and identification

Smidts, Pruyn and Van Riel (2001) demonstrated in Communication Research that employees who identify with their organisation are more willing to make extra effort and less inclined to leave. Pride in your organisation isn't sentimental; it's a predictor of behaviour.

Strategic alignment: the 'Line of Sight'

Kaplan and Norton (the creators of the Balanced Scorecard) already emphasised that strategic alignment is essential for performance. But alignment is rarely measured at the level of individual experience. This is about the 'Line of Sight' (LOS): the extent to which an employee sees the connection between their own role and the organisation's strategic objectives. You can have a strategy that's brilliant on paper, but if your employees don't feel it's also their story, it remains paper. More on this in our article on democratizing strategy.

What is the relationship between positive culture and business performance?

Positive culture is not a 'nice to have'. It's a strategic lever with measurable returns. The scientific basis for this is now robust and broad.

Productivity

Researchers at the University of Oxford (De Neve, Krekel & Ward, 2019) found that happy workers are 13% more productive than their less happy colleagues. This was not self-reporting but objective productivity measurement. Oswald, Proto and Sgroi (2015) confirmed this in four experimental studies published in the Journal of Labor Economics: positive emotions genuinely increase labour productivity.

Creativity

Barbara Fredrickson's broaden-and-build theory (2001), published in American Psychologist, shows that positive emotions broaden cognitive capacity. People who feel good see more possibilities, make more connections, and produce more creative solutions. Amabile and Kramer (2011) confirmed in The Progress Principle that positive inner work experience is a direct predictor of creativity and innovation.

Retention and loyalty

The meta-analysis by Harter, Schmidt and Hayes (2002), published in the Journal of Applied Psychology, analysed 7,939 business units. The finding: organisations in the top quartile of employee engagement have significantly lower turnover rates and higher productivity. Gallup's recent data (2025) confirm this: engaged employees have 43% less turnover.

A recent study on wellbeing and retention in Indonesian companies (2024) shows that employees with higher wellbeing scores are significantly more likely to stay with their employer. This isn't a Western luxury; it's a universal pattern.

Research by LinkedIn shows that organisations with a strong, positive employer brand achieve a 28% reduction in staff turnover. At a time when the cost of replacing a specialist employee can reach 1.5 times an annual salary, the ROI of culture measurement is directly visible on the balance sheet.

Absenteeism and work stress

And then there's the cost to employers. TNO (the Netherlands Organisation for Applied Scientific Research) calculated that psychosocial work pressure - including work stress and unwanted workplace behaviour - cost Dutch employers a staggering 4.4 billion euros in sick days in 2022 alone. That's not an abstract figure; those are real people sitting at home because the work culture is making them ill. Investing in a positive culture isn't just morally right; it's the most cost-effective HR strategy that exists. Curious how we put this into practice? See our Impact Report 2025.

Flexibility and resilience

Fredrickson's broaden-and-build theory also predicts that positive emotions increase psychological resilience. Employees who feel good can better cope with change, uncertainty, and setbacks. In a world that's becoming increasingly VUCA (volatile, uncertain, complex, and ambiguous), that resilience isn't a bonus; it's a survival requirement.

Lyubomirsky, King and Diener (2005) published a monumental meta-analysis in Psychological Bulletin spanning 275 studies and more than 275,000 participants. Their conclusion: happiness is not only the result of success but also a cause of it. Happy people are more productive, more creative, more social, and healthier. And that applies in organisations too.

How do you put this into practice?

The theory is convincing. But how do you start?

Step 1: Stop measuring what's easy; start measuring what matters

Don't replace the annual satisfaction survey with another annual survey. Replace it with a combination of:

• Short, frequent pulse checks (monthly, 5-10 questions) on specific themes
• Emotive measurements that uncover the drivers behind behaviour
• Qualitative moments such as dialogue sessions, reflection conversations, and team interventions

Step 2: Measure in layers

Not just satisfaction, but also:

• Experience of meaning and purpose
• Psychological safety within teams
• Sense of ownership and autonomy
• Pride in the organisation and its brand
• Alignment with strategy and values
• Energy levels and wellbeing

Step 3: Use emotive instruments

The 23plusone method makes it possible to compare employees' drivers with the brand profile and strategic ambitions of the organisation. This reveals where the energy sits, where the gap is, and where the opportunities lie. The Happiness Scan offers an accessible starting point for individual and team reflection.

Step 4: Make measurement a conversation, not a report

The value of measurement isn't in the report. It's in the conversation that follows. Use measurement results as a starting point for dialogue, not a final verdict. The most valuable question after a measurement isn't 'what's the score?', but 'what does this mean and what do we do with it?'

Step 5: Close the feedback loop

This is where most organisations fail. You measure, you analyse, you report, and then nothing changes. The feedback loop must be short and visible. Show employees what was done with their input. Not in a report that appears three months later, but in concrete actions within weeks.

Our approach: from measuring to moving

At BR-ND People, we combine emotive measurement methods with culture development and brand strategy. Because we believe the people are the brand, we always start with what truly drives people.

1. Driver analysis - using the 23plusone method, we map what employees, customers, and stakeholders truly find important. Not what they say, but what they feel.
2. Culture diagnosis - we compare the driver profile of employees with the desired brand profile. Where's the overlap? Where's the gap? Where's the energy?
3. Co-creative sessions - based on the insights, we design the desired culture together with teams. Not as imposed values, but as shared drivers recognised from the ground up.
4. Brand Experience Scan - we measure not only whether employees know the story, but whether they feel it. Is the emotional perception of the brand shifting in the desired direction?
5. Continuous monitoring - not an annual photo, but an ongoing film. With short, frequent measurements, we keep a finger on the pulse and adjust where needed.

An example? At BrabantZorg, we used the 23plusone method to map the drivers of employees and stakeholders as the foundation for a change narrative that was genuinely embraced. At Vintura, we mapped the gap between what employees personally find important and how they experience the organisational culture, with eNPS as a supplement but not the core.

From sentiment to identity: the future of measurement

The ultimate consequence of 'the people are the brand' is that culture measurement and brand stewardship merge into one. An organisation that internally maintains a culture of hierarchy and fear will never be credible externally as 'innovative' or 'customer-centric' - just as a sustainability claim isn't credible without proof. (Read: Greenwashing vs. impact branding.) In the age of Glassdoor and social media, the inside is the new outside.

True alignment emerges when employees' personal values resonate with organisational values. In science, this is called 'Person-Organization Fit'. When that fit is high, employees experience less stress, greater sense of meaning, and exhibit 'Brand Citizenship Behavior': spontaneously and enthusiastically representing the brand without being explicitly asked to do so. No campaign needed; the brand lives on its own.

The 23plusone method facilitates this by mirroring individual profiles against the desired culture. This turns culture data into a compass for strategic development, recruitment and leadership.

The role of leadership: the 'Leader Shadow'

Measurements are only as effective as the actions that follow them. And that's where leadership plays a crucial role through what we call the 'Leader Shadow': the effect of what leaders say, do, prioritise and measure.

When a pulse survey indicates that psychological safety is low, but the top of the organisation keeps hammering on individual targets without room for dialogue, the willingness to participate in future measurements will quickly evaporate. Leaders who measure and then do nothing are worse than leaders who don't measure at all. Because they create expectations they don't fulfil.

The way forward requires courage: looking beyond the numbers and engaging in dialogue about what truly adds value to work and life. Only then does the person become not just the brand, but also the source of inexhaustible creativity and sustainable growth.

Frequently asked questions

Is NPS completely useless then?

No, but it's not what it promises to be. NPS can be useful as a supplementary metric within a broader measurement framework. The problem arises when organisations build their entire CX or HR strategy on it. A single number can never capture the complexity of a human relationship. Use NPS as a compass, not a map.

What is the difference between NPS and eNPS?

NPS (Net Promoter Score) focuses on customers: 'Would you recommend us?' The eNPS (employee Net Promoter Score) asks the same question of employees: 'Would you recommend us as an employer?' While the eNPS is popular as a quick gauge of employee engagement, it shares all the limitations of regular NPS: it reduces a complex relationship to a single number, it explains nothing, and it's susceptible to cultural distortion and score-gaming.

Aren't pulse surveys just 'ordinary surveys'?

Yes and no. They're shorter, more frequent, and faster to process. But they still measure rational self-reporting. The real added value emerges when you combine pulse surveys with emotive methods and qualitative conversations. Pulse surveys are the heart rate monitor; emotive measurements are the MRI.

How often should you run pulse surveys?

Most experts recommend monthly or fortnightly, with a maximum of 5 to 10 questions. Too frequent (daily) leads to survey fatigue; too infrequent (quarterly) misses the speed that makes pulse surveys valuable in the first place. The key is consistency: better five questions every month than twenty every quarter.

What is the difference between employee satisfaction and employee engagement?

Satisfaction measures whether employees are 'happy' with their working conditions: salary, office, colleagues. Engagement goes deeper: it measures whether employees are emotionally connected to their work and the organisation, whether they're willing to go the extra mile, and whether they're proud of what the organisation stands for. You can be satisfied and still not engaged. Gallup shows that globally only 23% of employees are genuinely engaged, while satisfaction scores are often much higher.

How does 23plusone differ from a personality test?

A personality test (such as MBTI or Big Five) measures who you are. 23plusone measures what's currently driving you. It's a snapshot of drivers, not a label. And it can be repeated to measure change over time. Moreover, 23plusone works with visual stimuli and time pressure, reaching the unconscious, emotional layer that rational questionnaires miss.

What is Person-Organization Fit and why does it matter?

Person-Organization Fit (P-O Fit) describes the degree to which an employee's personal values align with the organisation's values. Research shows that high P-O Fit leads to less stress, greater sense of meaning, lower turnover intention, and more 'Brand Citizenship Behavior': spontaneously representing the brand without being asked. If the people are the brand, P-O Fit is the glue connecting culture and strategy.

What does it cost when employees aren't engaged?

The costs are substantial. Gallup estimates that low engagement costs the global economy $8.9 trillion per year. In the Netherlands, TNO calculated that work stress alone costs 4.4 billion euros per year in sick days. Add to that the cost of turnover: replacing a specialist employee can cost up to 1.5 times an annual salary. Not measuring what matters isn't cheap; it's the most expensive choice.

What is psychological safety and why does it matter for my organisation?

Psychological safety is the shared belief that it's safe to take interpersonal risks within a team - think admitting mistakes, asking questions, or expressing a dissenting opinion. Amy Edmondson (Harvard) demonstrated that it's the strongest predictor of team effectiveness. Google's Project Aristotle confirmed this. BCG (2024) calls it a 'levelling force' that enables employees from all backgrounds to unlock their potential.

What if my organisation isn't ready to let go of the annual survey?

Then start alongside the annual survey with supplementary measurements. Introduce a monthly pulse check on three to five themes. Add an emotive measurement as an experiment. And let the results speak for themselves. Most organisations let go of the traditional survey naturally once they discover that new instruments deliver better insights.

What is the effect of positive workplace culture on productivity?

Research from the University of Oxford (2019) shows that happy employees are 13% more productive. This was not self-reporting but objective productivity measurement. Oswald, Proto and Sgroi (2015) confirmed this in the Journal of Labor Economics. Additionally, Fredrickson's broaden-and-build theory demonstrates that positive emotions broaden cognitive capacity, leading to greater creativity and better problem-solving.

Isn't 'measuring happiness' too soft for a business context?

That's what many organisations thought about engagement, purpose, and psychological safety too - until the data showed these are direct predictors of hard business results. Happiness at work isn't a feel-good project. It's a strategic variable with measurable returns. Oxford, Gallup, and hundreds of other studies confirm this.

How do I start with emotive measurement?

The most accessible starting point is the 23plusone Happiness Scan. You can experience it yourself and then explore how the method can be deployed at team or organisation level. For a full culture diagnosis, BR-ND People combines the 23plusone method with co-creative sessions and continuous monitoring.

References and scientific sources

Amabile, T.M. & Kramer, S.J. (2011). The Progress Principle: Using Small Wins to Ignite Joy, Engagement, and Creativity at Work. Harvard Business Review Press.

BCG (2024). Psychological Safety Levels the Playing Field for Employees. Boston Consulting Group.

Deci, E.L. & Ryan, R.M. (2000). The "What" and "Why" of Goal Pursuits. Psychological Inquiry, 11(4), 227-268.

De Haan, E., Verhoef, P.C. & Wiesel, T. (2015). The Predictive Ability of Different Customer Feedback Metrics for Retention. Journal of the Academy of Marketing Science, 43(1), 1-15.

De Neve, J.E., Krekel, C. & Ward, G. (2019). Work and Well-being: A Global Perspective. Global Happiness and Wellbeing Policy Report.

Edmondson, A.C. (1999). Psychological Safety and Learning Behavior in Work Teams. Administrative Science Quarterly, 44(2), 350-383.

Edmondson, A.C. (2019). The Fearless Organization: Creating Psychological Safety in the Workplace for Learning, Innovation, and Growth. John Wiley & Sons.

Fisher, C.D. (2010). Happiness at Work. International Journal of Management Reviews, 12(4), 384-412.

Fredrickson, B.L. (2001). The Role of Positive Emotions in Positive Psychology: The Broaden-and-Build Theory of Positive Emotions. American Psychologist, 56(3), 218-226.

Gallup (2025). State of the Global Workplace 2025.

Gartner (2021). Gartner Predicts More Than 75% of Organizations Will Abandon NPS as a Measure of Success by 2025.

Google (2015). Project Aristotle: Understanding Team Effectiveness.

Harter, J.K., Schmidt, F.L. & Hayes, T.L. (2002). Business-Unit-Level Relationship Between Employee Satisfaction, Employee Engagement, and Business Outcomes: A Meta-Analysis. Journal of Applied Psychology, 87(2), 268-279.

Kahneman, D. (2011). Thinking, Fast and Slow. Farrar, Straus and Giroux.

Kaplan, R.S. & Norton, D.P. (2006). Alignment: Using the Balanced Scorecard to Create Corporate Synergies. Harvard Business School Press.

Keiningham, T.L., Cooil, B., Andreassen, T.W. & Aksoy, L. (2007). A Longitudinal Examination of Net Promoter and Firm Revenue Growth. Journal of Marketing, 71(3), 39-51.

Lyubomirsky, S., King, L. & Diener, E. (2005). The Benefits of Frequent Positive Affect: Does Happiness Lead to Success? Psychological Bulletin, 131(6), 803-855.

Oswald, A.J., Proto, E. & Sgroi, D. (2015). Happiness and Productivity. Journal of Labor Economics, 33(4), 789-822.

Pierce, J.L., Kostova, T. & Dirks, K.T. (2001). Toward a Theory of Psychological Ownership in Organizations. Academy of Management Review, 26(2), 298-310.

Prosci (2023). Best Practices in Change Management. 12th Edition.

Reichheld, F.F. (2003). The One Number You Need to Grow. Harvard Business Review, 81(12), 46-54.

Seligman, M.E.P. (2011). Flourish: A Visionary New Understanding of Happiness and Well-being. Free Press.

Smidts, A., Pruyn, A.T.H. & Van Riel, C.B.M. (2001). The Impact of Employee Communication and Perceived External Prestige on Organizational Identification. Academy of Management Journal, 44(5), 1051-1062.

Spreitzer, G. & Porath, C. (2012). Creating Sustainable Performance. Harvard Business Review, 90(1-2), 92-99.

Steger, M.F., Dik, B.J. & Duffy, R.D. (2012). Measuring Meaningful Work: The Work and Meaning Inventory (WAMI). Journal of Career Assessment, 20(3), 322-337.

SWOCC (2023). Brand Management Models: The SWOCC Selection. University of Amsterdam.

TNO (2022). Arbobalans 2022: Kwaliteit van de arbeid, effecten en maatregelen in Nederland.