Prerequisites can be added onto schedules to restrict which candidates can book meetings on employer schedules.
Employers can set up prerequisites when creating schedules. They can also edit prerequisites on an existing schedule (video).
As the Fair Organizer, you control which prerequisites employers can choose from. When you set up the Candidate Profile Fields, any fields that you make 'required' will be added to the potential prerequisites that employers can screen from.
See this article for more information on Candidate Profile Fields.
Our general recommendation to Fair Organizers and employers is not to set prerequisites on schedules, for two reasons.
Firstly, it can have a larger than expected (negative) impact on appointment numbers.
Secondly, we think it's important to maintain the open environment of an in-person fair, where anyone can approach the 'booth' and speak to recruiters.
However, if an employer has a hard requirement, the prerequisites feature can enable them to screen candidates.