When participants create an account, they have to provide
their e-mail address. This e-mail address is used to
send participants invitations and reminders to participate.
The first invitation is send to the participants of
the experimental condition who have not completed the
three game scenarios that they were supposed to play at
school. After a week they receive a reminder. The same
procedure happens for both conditions when participants
do not complete the first follow-up measurement
at school. Eight months after they have created an account,
participants are invited to respond to the last
follow-up questionnaire. If they do not respond they
receive a first reminder after one week and a second reminder
after two weeks.