Decide from peak-day use, turnaround, losses and actual cost of ownership records.
On peak days, separately record units in use, awaiting return, under repair and causing missed dispatches. Improving cleaning and return flow may free capacity; compare purchase, rental and current-fleet cost components. Expand when demand still exceeds capacity at the bottleneck. Document the decision with shift data and finance approval.
Before expanding the fleet, measure whether unit count is the actual bottleneck. Separate units in use, awaiting return, in cleaning and under repair on peak days.
Use shift and route records to calculate concurrent demand, return time and missed dispatches. Test how changes to cleaning, allocation or returns affect capacity.
Compare any remaining gap with purchase or rental costs. Use actual records for maintenance, spares, loss and storage, then document approval.
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