The interview process runs through, and with, the project manager (who is not a curriculum person), also conducted with a site manager (who typically is). Their process is short and very organized. Because of the dynamic of the contract, turn-over is limited and typically interviewees are well-known in a limited market. One telephone, one face-to-face interview process and then selection decisions are made. In the years (over 4) that I've been around this company, not a single employee has left (except for mandatory family moves). People are rewarded and happy and it's a tight-knit group.
