1. Test a complete workshop job
Choose a typical job, such as a four-tyre quote with fitting and an alignment, and use the same example in each trial. Create the customer and vehicle, prepare the quote, record approval, create the work order and finish the invoice. Include a change to the requested work. Watch where staff have to re-enter information and whether the final record shows what was agreed and completed. A feature list alone will not show how that handover feels.