Who loses access when meals move to preorder?
Study design
Observe both shifts at paired sites, and interview workers who did not order. Track meal availability, waste and workers who could not use the ordering channel.
Instrument and data fields
Use a time-stamped queue sheet and a brief intercept question about phone access, language and payment method.
Simulated evidence
At the pilot site, unsold meals fall from 20 to 9 out of 180. At the comparison site they fall from 18 to 16 out of 180. Six pilot interviewees report difficulty placing an order.
Check before drawing a conclusion
Write down the comparison you would make and the unit each row represents. Identify one explanation the study design cannot rule out, then describe how it would affect the decision.
Reveal the worked analysis
The relative change is nine fewer unsold meals per 180 prepared. Test a staffed preorder lane before expanding so workers without reliable phone access can participate.
The paired-site result could reflect site-specific changes. Small intercept samples help identify barriers rather than estimate prevalence.