Shift Patterns and What People Choose Between
Use digital records to locate a process problem, not to make an unsupported judgment about a person. That distinction should be written into any evaluation of view details and reflected in who can access the resulting data.
When this issue touches live workplace policy, compare the local evidence with guidance published by International Labour Organization before changing a process or communicating a rule.
The rota is the largest single determinant of who applies and who stays, and it is usually designed around the operation alone.
People accept and leave warehouse jobs for the hours more often than for the money, and the hours are decided by somebody optimising something else.
What the common patterns are
Four on four off, twelve hours, which suits some people extremely well and excludes anybody with fixed childcare.
Five eights, fixed days, which is the most compatible with an ordinary life and the least flexible for the operation.
Rotating shifts, which are the worst for health and for retention and are sometimes unavoidable.
Permanent nights, which attract a specific group who value the premium and the quiet.
And twilight shifts, which are the most underused and fit students, second jobs and people with daytime caring responsibilities.
What people actually optimise for
Predictability, first. A pattern they can plan around beats a better-paid one they cannot.
Whether it fits transport. A shift ending after the last bus excludes everybody without a car, which on many sites is most applicants.
Whether it fits childcare, which rules out large parts of the local labour market for early starts and weekend work.
Total hours, not rate. Somebody comparing two jobs compares the weekly figure.
And recovery time, which is why four on four off retains people that five twelves would not.
Designing for the labour market you have
Look at who lives within a realistic travel time, and what they can work.
A site surrounded by residential housing with school-age children has a different available workforce from one in an industrial area near student accommodation.
Which argues for more than one pattern: a core of long shifts, a twilight option, a weekend-only option.
Multiple patterns cost planning effort and open a labour pool that a single pattern excludes.
Fixed against rotating
Rotating shifts damage sleep and health and are associated with higher attrition in almost every study.
Where the operation genuinely needs cover around the clock, permanent teams per shift beat rotation, provided the night premium is adequate.
Where rotation is unavoidable, rotate forwards and slowly — mornings to afternoons to nights, over weeks rather than days.
And do not rotate people who asked for a fixed pattern at interview unless the advert said so.
Overtime
Mandatory overtime at peak is a common arrangement and a common reason people leave.
Voluntary overtime with enough takers is better and requires the base rota to be adequately staffed.
Which means mandatory overtime is usually a symptom of under-recruitment rather than a policy.
Say in the advert if it is mandatory, because the people who cannot do it will find out in week two either way.
Changing a pattern
Existing staff built their lives around the current one.
A change made without consultation loses people who would otherwise have stayed for years, and it loses them quickly.
Consult, offer alternatives where possible, and give long notice — which in several jurisdictions is a legal requirement and everywhere is the difference between a change and an exodus.
The measure
Attrition by shift pattern, which is the comparison that identifies the bad one.
Applications by pattern, which shows what the market will take.
Overtime hours as a proportion of scheduled, which if high is a recruitment finding.
And the proportion of leavers citing hours, which is usually the largest category and is usually recorded as "personal reasons".
Letting people swap
A shift swap system that works removes a large share of the absence and some of the attrition.
Because a person who cannot attend one Tuesday and has no mechanism either takes an unauthorised absence or leaves.
Rules stated: who may swap with whom, what notice, who approves, and whether it affects premiums.
Administered quickly, because a swap approved after the shift has happened is not a swap.
Rotas that change without warning
A pattern published two weeks ahead is worth more to people than a pattern that is better and announced on Friday.
Publish the horizon you can actually hold, and hold it.