Shift Change and Queues

Most attendance systems are designed for the single arrival and deployed into a shift change.

What happens at handover

Thirty people arrive within a few minutes.

Thirty phones request a position simultaneously, in the same doorway, with the same poor indoor conditions.

Thirty punches hit the same mobile cell, which in a basement or a large building may be congested.

Some succeed instantly, some take thirty seconds, some fail.

And the people who fail are the ones at the back of a queue that is already moving.

Why it is worse than it looks

A punch that takes twenty seconds is fine once and unworkable thirty times.

People start punching from the car park where the signal is better, which defeats the point entirely and is a rational response.

Or they punch later, at their workstation, and appear late.

The system then records a punctuality problem it created.

Designing for it

Do not rely on a single doorway. Coverage at one point is a single point of failure at scale.

A fixed terminal handles volume far better than thirty individual satellite fixes, and it is cheap.

Wifi or beacon verification works at the door where satellites do not, and does not congest.

Stagger the punch window: accepting a punch within fifteen minutes either side of the shift start removes the crush without changing when work begins.

That last one costs nothing and solves most of it.

Measuring it

Punch success rate in the five minutes around shift start, compared against the rest of the day.

A gap between them is the queue problem, and it is invisible in an overall figure.

Time from app open to punch accepted, sampled at handover.

Ask the people at the back of the queue. They know exactly how long it takes and nobody has asked them.

The hidden cost

A slow punch at handover delays the outgoing shift too, because handover cannot start until people are in.

In healthcare and in continuous manufacturing that is a safety-adjacent cost, not just an inconvenience.

Which is worth raising when the system is specified, because the buyer is usually thinking about a single arrival.

The check before deployment

Stand at the door at shift change with a stopwatch.

Time ten punches.

If any take more than a few seconds, the deployment will produce a queue and the queue will produce workarounds.

The punch window

The cheapest fix in this collection.

Accept a clock-in within fifteen minutes either side of the shift start.

The crush disappears because nobody needs to punch in the same thirty seconds.

Work still begins when it begins, because the window is about the record, not the rota.

And a few seconds of fix delay stops being lateness, which removes most of the reason people punch from the car park.

Connect policy to configuration

The practical choices behind this note can be compared with staffing agency time tracking software. Keep the written purpose in control and enable only the data needed for it.