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Cluster-Randomised Hotel Coating Trials: Allocate by Housekeeping Team

Consider housekeeping-team effects when planning a hotel glass-coating trial, and keep the team-level allocation visible in the analysis.

Updated · NANOLAB Knowledge

Editorial illustration: A Practical Quality-Control Process for Ceramic Coating
Editorial illustration

In a hotel trial, rooms are not always maintained independently. One housekeeping team may use a different pace, towel routine or inspection standard from another. If every coated room belongs to one team, the coating and team effects become difficult to separate.

Choose the allocation unit deliberately

A trial may allocate individual rooms within teams or allocate whole teams or floors. The choice depends on practical contamination risks, training and the question being tested. Discuss the design with a qualified analyst when the results will support a major rollout or claim.

Preserve the cluster structure

If treatment is assigned by team, record the number of teams as well as the number of rooms and cleaning events. Hundreds of room observations do not automatically create hundreds of independent treatment assignments.

Level Record
Team Allocation, training and staffing changes
Room Glass type, occupancy and exposure
Visit Task, accepted time and rework

Balance practical differences

Include comparable room types and workload where possible. Keep the cleaning acceptance standard common. If staff rotate between teams, record the change rather than pretending the original groups remained separate.

Interpret a pilot cautiously

A comparison involving only one team per condition cannot cleanly distinguish the product from the team. It may reveal workflow issues and help plan a larger study, but a simple average of all room times can overstate the evidence.

The useful output is a design that matches hotel operations and an analysis that respects that design. Planning the allocation before application is far easier than repairing an uninterpretable comparison after every room has been treated.

Ask NANOLAB about your surface and intended use. For application and care, use the current instructions for the exact product.