A School of Continuous Improvement poster finds no effect of completion-beep count on how long food waits in a microwave, and the Review Cadence Observatory settles the count at three.
An equivalence trial in 84 households finds food waits the same however many times it beeps
The number of times a microwave beeps at the end of cooking has, until now, been left to the manufacturer. A research poster from the School of Continuous Improvement, published today, sets out what happens to the food when that number is changed, and the University has settled the count as a result.
The poster is led by Doctoral Candidate Edda Nwafor, with Senior Lecturer Dr Renke Sabel, Convenor of the Indicator Commons, and Research Fellow Dr Osei Vandermeer, Convenor of the Review Cadence Observatory.
A household appliance is a good place to find out what a number is for. We are grateful to the households who let us listen.
— Doctoral Candidate Edda Nwafor, School of Continuous Improvement
Eighty-four households took part over fourteen weeks, each appliance set in advance to one of four completion signals. The work brings a pre-registered equivalence design to an everyday kitchen threshold, and finds the interval between the final beep and the opening of the door to be the same across every setting tested.
On the strength of the result, the Review Cadence Observatory has fixed the count at three for every appliance signal in University-recognised households. Requests for variance are not received, and the count has left the Observatory’s review schedule. Dr Vandermeer said the Observatory “welcomes a number that no longer needs a date beside it.”
The University is pleased to add the household microwave to the settings in which its measurement practice now reaches.
The full poster is available from the University’s research repository under an open licence, doi:10.5555/slop.aua1k1.