Behavioural Insights Projects

Are people more likely to file their tax returns correctly if they receive a thank-you in advance or afterwards? Analyses show that thank-you messages have no effect on compliance behaviour. Why this experiment was conducted: positive alternative sought To encourage citizens' tax compliance (i.e., paying their taxes on time and correctly), it is occasional practice to emphasise the risk of checks and fines in case of non-compliance. One drawback of this deterrent method is that it can damage…

Institution: Dutch Tax and Customs Administration

The Municipality of Dordrecht organised a competition titled The Cleanest Neighbourhood in Dordrecht. The aim was to get residents to place less rubbish next to underground waste containers. As a result of the experiment, the amount of waste left next to bins decreased and a new social norm was established. Why this experiment was conducted: rubbish left next to waste containers Bin liners and other bags containing residual and larger waste left next to underground containers rank amongst the…

Institution: Netherlands Municipality of Dordrecht

How can response rates to questionnaires be increased? In the first quarter of 2023, some of the participants in a CBS survey received a letter in which the call-to-action appeared as far as possible at the top of the letter. The other participants received standard letters. The analyses showed that the standard letters produced a significantly higher response rate than the letters in which the call-to-action was placed at the top. Why this experiment was conducted: high response rate is…

Institution: Statistics Netherlands (CBS)

The 'Fit op jouw manier' (Fit your way) campaign aims to encourage overweight individuals to get after. The campaign successfully reaches the target audience, motivating them with tips that they then practice. For example, more people now regularly take the stairs instead of the life or escalator. Why this experiment was conducted: combating overweight and obesity The Prevention Agreement aims to reduce the proportion of overweight adults from 50% in 2018 to 38% by 2040. A healthy lifestyle…

Institution: Netherlands Ministry of Health, Welfare and Sport

A series of controlled randomised experiments was conducted to examine the savings effects for households of three types of energy consumption managers tools: an email + web application, an app installed on a smartphone or tablet and an in-home display. Energy savings could only be established for the in-home display: almost 7% on natural gas and over 2% on electricity consumption. Why this experiment was conducted: The Netherlands' climate targets Energy consumption by Dutch households…

Institution: PBL Netherlands Environmental Assessment Agency

This experiment involved making the information on the WBSO website clearer and more personally relevant to entrepreneurs. The visibility of the call-to-action was also enhanced. The study showed that entrepreneurs were prompted to spend more time exploring the possibilities offered by the Research and Development (Promotion) Act (WBSO) and that they read the information more carefully. Why this experiment was conducted: number of new applications below expectations The Research and Development…

Institution: Netherlands Ministry of Economic Affairs and Climate Policy and Netherlands Enterprise Agency (RVO)

In a vignette survey, teachers in primary, secondary and post-secondary vocational education were asked whether they would like to work more hours − with and without incentives. The survey shows that their willingness to do so can be increased to varying degrees by offering them bonuses, additional employee benefits and a combination of both. Why this experiment was conducted: teacher shortages The government has identified significant staff shortages in primary and secondary education. It is…

Institution: Netherlands Ministry of Education, Culture and Science

Why this experiment was conducted: scepticism about second-hand clothes The clothing industry is a major polluter, and the second-hand market is an important alternative to new clothes. While more and more Dutch consumers are turning to pre-owned clothing, a large group remains sceptical. According to a target group study conducted in 2020, they wonder whether they will be able to find a suitable second-hand item, and whether it is hygienic. The best way to overcome this scepticism is to create…

Institution: Dutch Ministry of Infrastructure and Water Management

Small and Medium-sized Enterprises are particularly vulnerable to cyberattacks. A large-scale field experiment amongst SME employees showed that a phishing test is effective in the short term, but not in the medium or long term. Why this experiment was conducted: SMEs are vulnerable to cyberattacks Phishing is one of the most common types of cybercrime and is frequently the precursor to additional cyber threats, including malware and ransomware attacks. SMEs are vulnerable, with many of them…

Institution: Netherlands Regional Platform of Crime Control North-Holland and the Ministry of Economic Affairs and Climate Policy

Rijkswaterstaat (the Directorate-General for Public Works and Water Management) wants to induce behavioural change in several areas. The circular economy is one example. A study examined whether consumers will make more sustainable choices if they have been complimented on their past actions or behaviour that were environmentally friendly or sustainable. This proved to be the case. Why this experiment was conducted: additional incentive for sustainable behaviour Behavioural change is…

Institution: Rijkswaterstaat's Circular Economy & Waste department