Bi Project Status: Completed

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 'Doe meer met taal' (Get more out of language) campaign was launched to reach out to individuals with limited literacy skills whose mother tongue is Dutch. At its conclusion, people in the target group said they felt more motivated to improve their language skills. They are also more inclined to take proactive steps, for example by engaging in language-related activities at home. 66,000 people visited the campaign website. Why this experiment was conducted: everyone should be equipped with…

Institution: Netherlands Ministry of Social Affairs and Employment and Ministry of Education, Culture and Science

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

In this experiment, various emails were sent to students in senior general secondary education (HAVO) and preuniversity education (VWO) to inform them about open days of teacher training programmes. The subject line that most caught their attention was ‘Are you looking for job security, challenge and a wide range of career opportunities?’ as well as a subject line in which a role model was introduced. Where emails mention teachers' starting salaries, students most often click links to more…

Institution: Netherlands Ministry of Education, Culture and Science

In a series of field experiments, six municipalities investigated whether a different approach in social assistance could get more people into work. The study focused on the effects of an exemption from the obligation to seek work, more intensive counselling or higher earnings disregards for additional income. A different approach can increase the number of people finding jobs. More research is needed. Why the experiments were conducted: increasing the effectiveness of the Participation…

Institution: Deventer, Groningen, Nijmegen, Utrecht, Tilburg and Wageningen

Some jobseekers remain unemployed because they focus on professions and felds in which the job prospects are not favourable. What happens when they receive personalised labour market information about more promising professions and positions that match their knowledge and skills? Compared to people who do not receive that information, they are more likely to move into professions that are completely different from the profession with poor job outlooks that was their first preference. Why this…

Institution: Netherlands Employee Insurance Agency (UWV)

Not all UWV clients who receive unemployment benefit post their CVs on werk.nl. This prevents them from being found or matched for a job. Would it help to send them a reminder to their personal Work Folder as well as a text message? Yes it would: this experiment shows that five times more clients are then prompted to put their CV online, compared to clients who are not sent a reminder. Why this experiment was conducted: missing CVs 25% of jobseekers on unemployment benefit who are asked to post…

Institution: Netherlands Employee Insurance Agency (UWV)

To reduce calf mortality rates, the Netherlands Food and Consumer Product Safety Authority (NVWA) developed various letters for distribution amongst three subgroups of dairy farmers. The impact measurement shows that calf mortality decreased in the overall target group, although the letters did not produce any measurable outcomes. Why this experiment was conducted: calf rearing necessitates a significant amount of care Failure to ensure appropriate care for animals in dairy farming operations…

Institution: Netherlands Food and Consumer Product Safety Authority

A campaign was launched to encourage young people to get the catch-up vaccination against Human Papillomavirus (HPV). The campaign succeeded in promoting discussion and increased awareness of HPV as well as persuading young people to get vaccinated. Why this experiment was conducted: provide boys and girls with a vaccine they might not have received In 2022 and 2023, boys were invited for the first time and girls were invited again to get vaccinated against the Human Papillomavirus (HPV). HPV…

Institution: Dutch National Immunisation Programme

In early 2022, various kinds of text messages were sent to over 100,000 residents of Brabant-Zuidoost who had not yet received a booster jab from the GGD. The results show that the most effective variant − in the 6 days after receiving the text message − led to a 3.2% increase in the number of vaccinations administered. This was the text message saying 'Jouw boosterprik ligt voor je klaar' (You can now book your booster vaccination) plus a randomly allocated date, time and location. Why…

Institution: Netherlands Public Health Service