in Korea almost everyone (no matter whether it's a cafe, restaurant or shop) using a fingerprint identification. So I basically have a system where can see when all my staff came and left. And I also have a bonus-system once a month for those who's never late (like free McDonald, Starbucks or CGV coupons) and every month we are choosing the best worker (with money compensation, not large though, but at least my guys are trying to do their best). The personnel works perfectly, almost no one late, and each of them already had a free coupon. My customers are always satisfied with the service.