Proof of physical resistance, such as Barber Honour championship card the customer believe Barber or inserted the same uniform. Make people believe in the store's standard, etc.
Reviewed physical evidence, such as a certificate champion Barbers Barbers give customers confidence to wear uniforms or have the same confidence in the standards of the people and so on.
Some physical evidence, such as barbershop, noble card champion cut I make customers believe or have to wear the uniform. Too, make people believe in the standard of the store. And so on.