First-come, first-served
First-come, first-served is a rule that serves customers strictly in the order they arrived, also known as first in, first out (FIFO).
Also called: FIFO, first in first out, first come first served
First-come, first-served is the oldest queue rule and the one people expect. Whoever has waited longest goes next. It needs no explanation, which is exactly why it feels fair.
Strict order breaks down in real shops. A customer who asks for one barber may wait behind people who would accept anyone, while another chair sits idle. A five-minute beard trim and a two-hour color can be in the same line. Many businesses therefore use first-come order within each team member, or with posted exceptions.
The key is that the rule is visible. If customers can see their place and the order does not change without reason, they will accept a long wait. If it appears to shift, trust goes quickly.
How NextUp Walk-in handles it
Customers join in the order they check in and see their place on their phone. Someone who asks for a specific team member is kept in that person line, so the order is by person rather than one line for the whole shop.
Questions
What does FIFO mean in a queue?
FIFO means first in, first out. The first person to join is the first one served, with no skipping ahead.
Is first-come, first-served always fair?
It is simple and transparent, but it ignores the length of the service and customer requests. Shops often keep the order and add clear rules for those cases.