The difference between a pilot and a prolonged argument is a decision rule agreed before the start. Six months is the research standard for a four-day week trial — long enough to outlast novelty and meet a busy period. Here is how to structure one so it ends, on a known date, with a decision people trust.
Allow a preparation phase
Do not count preparation as pilot time. Coordinated programmes such as those run by 4 Day Week Global have typically used a two-to-three month lead-in: workshops on prioritisation, time management, process redesign and measurement, plus contact with firms that have already made the change. Use it to baseline, redesign and communicate — not to generate launch publicity.
By the end of preparation each team should be able to name the three to five outputs that define its “100%”, the work it will stop or reduce, and its coverage pattern. If a team cannot name what stops, it is not ready, and launching anyway teaches it to absorb five days of work into four.
Pre-commit the design
Agree and write down: fixed day off or staggered days; how holiday weeks and peak periods work; whether the day is guaranteed or conditional; and what would trigger a pause. Conditional variants exist — on-call expectations, performance conditions — but each one dilutes the benefit and must be disclosed openly. Staff can accept a tough design they can see; they resent conditions discovered later.
Agree the customer floor before launch: response times, resolution standards and satisfaction measures that must hold. Agree a people ceiling too: actual hours, after-hours messaging and stress pulses that must not deteriorate. A pilot that hits its output targets through hidden overtime has failed; it just has not admitted it yet.
Run it visibly
During the six months, review a short dashboard weekly at operational level and monthly with the sponsor: outputs, quality, customer measures, actual hours, absence and a brief wellbeing pulse. Hold client check-ins around months one and three. Fix problems in the open — re-time a meeting-heavy day, add buddy cover, clarify a handover — rather than letting teams quietly hand the day back.
Track subgroups, not only averages. One team can be drowning while the firm-wide chart looks serene. Your midpoint review should have explicit authority to change the design; what it should not do is drift the end date.
Decide, on the date
End with the criteria you published at the start. A workable set: continue if the customer floor held, quality did not fall materially, actual hours really fell, wellbeing improved or held, and no subgroup was harmed. Extend if the picture is mixed and one more quarter would resolve it. Stop if floors are breached repeatedly after genuine attempts to fix the design.
Publish the results, including the misses, and consult staff before the final call. If the answer is no, explain what the data showed and what would have to change; a transparent ending preserves the trust you will need for the next change. If the answer is yes, move to contracts, onboarding and periodic re-measurement — permanence is a new phase, not the end of management.
A pilot designed this way does something valuable even when the answer is not four days: it leaves the organisation with baselines, a stop-doing list and managers who can talk about output instead of attendance. That is a return on six months regardless of the verdict.
Budget for the pilot as a change programme, not a diary experiment. There will be workshop time in preparation, manager training, some backfill for teams building rotas and dashboards, and honest communication work with clients. None of this is large beside the cost of a failed, drifting trial that consumes goodwill for a year and ends in rumour. Naming the budget at the start also disciplines the design: a pilot you have resourced properly is a pilot you are actually willing to judge.
Sources
- Fast Company, 2023, on 4 Day Week Global preparation workshops: https://www.fastcompany.com/90932623/so-youve-decided-to-implement-a-4-day-workweek-now-what
- Autonomy, University of Cambridge, Boston College and 4 Day Week Global, UK pilot results, February 2023: https://www.sciencedaily.com/releases/2023/02/230221113132.htm
Day5Group is a consultancy that assists in the transition to a 4 day work week. More about Day5Group · All blog articles