Table 1 Items in survey for each theoretical construct

Coherence

It is clear for me how the school lunch differs from the current way of eating lunch at my school

I believe that children at my school will eat healthier by offering a school lunch

I believe that a school lunch will contribute to more equality among children at my school

Cognitive participation

I think that offering a school lunch at my school is a good idea

Offering a school lunch is compatible with the tasks of my school

I am willing to invest time and energy to set up a school lunch at my school

I expect that a school lunch—as shown in the video—needs to be adapted in order to start at my school

Collective action

In the research, we learned that a well-organized and healthy school lunch can only be achieved if there is support in terms of staff (for example, an employee who prepares lunch),financing for lunch products and necessary materials (such as a refrigerator). It is also necessary to reserve about half an hour for lunch. When answering the questions below, you can assume a situation in which support and financing has been arranged for your school for a healthy and well-kept school lunch

 I expect that implementation of a school lunch has large consequences for my daily activities at school

 I am fine with extending the school day at my school in order to have enough time (30 min) for a school lunch

 I expect that a school lunch at my school will enhance my work pleasure

 I expect that my colleagues will be enthusiastic about a school lunch at our school

Reflective monitoring

Imagine that the school lunch has been offered at your school for a few months

 I can visualize that the school lunch can become part of the daily routine at my school

 I would like to know the effects that the school lunch has on the children of my school

 I would like to have the freedom to adapt the school lunch—as shown in the video—at my school