Customer reviews and trial Software only when you reach the last step. If there is something that does not meet the requirements of the customer. Editing difficult too expensive, waste of time
Software customers see and try it out on the final stage. If there is something that does not meet the needs of the customer to fix it is a waste of time.
Customers see the trial and Software when reach the final stage. If there is something that does not meet the needs of customers. Solving difficult, expensive, time.