After the second or third round of interviews, you have probably narrowed down the recruitment selection to your top three candidates. A great way to observe the behavior of a candidate is through an informal lunch or dinner before you make a final decision.
Lunch or dinner in more of a relaxed setting opens up the floor for a more comfortable conversation. Notice how the candidate treats the waitstaff, decides on food/drinks, and handles casual conversation. Observing these attributes will be an early indicator of how the candidate will fit into the work culture, interact at networking/company events, or handle client meetings. No matter how many interviews a person goes on, there will always be nerves. Having lunch or dinner with a candidate allows them to let their guard down and be more relaxed, showing you more of their personality.