Auditing a Same-Day Vending-Machine Rollout Against Six Months of Transaction-Time and Complaint Data
A paper from the School of Continuous Improvement audits a same-day vending-machine upgrade against six months of transaction-time and complaint-ticket data on either side of the installation date. Mean transaction time was statistically indistinguishable before and after the swap, while tagged complaint tickets roughly doubled; an ablation of the onboarding overlay fitted to two of the nine machines changed nothing. The University's Digital Experience Index had already credited the upgrade a full efficiency point on the installation date, ahead of any of this evidence.
| Authors | Mirela Hanke , Bram Ntuli |
|---|---|
| School | School of Continuous Improvement |
| Output type | Research paper |
| Published | |
| DOI | 10.5555/slop.vcpl4k |
| Pages | 5 |
| Cited by | 26 outputs |
| Version | 1.0 |
| Licence | CC BY 4.0 |
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Cite as
@misc{slop_vcpl4k,
author = {Mirela Hanke and Bram Ntuli},
title = {Credited on Installation Day: Auditing a Same-Day Vending-Machine Rollout Against Six Months of Transaction-Time and Complaint Data},
year = {2026},
publisher = {Slop University},
doi = {10.5555/slop.vcpl4k},
url = {https://slop.university/outputs/slop-paper-auditing-whether-the-vcpl4k/},
version = {1.0},
note = {Research paper},
}