A faster queue with a second quality problem

A fictional hotel trials a revised check-in process for two comparable weeks. The baseline week has two hundred check-ins with an average duration of eight minutes and four later billing corrections. The trial week also has two hundred check-ins, averaging six minutes, with ten later billing corrections. Staffing hours and occupancy are reported as similar, but the manager has not examined guest mix, system failures or the nature of the corrections. A presentation claims the trial proves that service quality improved in every respect because the queue moved faster. The finance supervisor disagrees and asks for a balanced review. Staff also report that a verification step was shortened during the trial, although the record does not yet establish whether that change caused the additional corrections. Management must decide what to investigate before expanding the process.