Most often best practices are hard to follow and often questioned on the rationale behind the same. Recently I had my car serviced at the car vendor’s service outlet. Always there was a question that lingered in my mind on a card board box that gets placed at the top of the car indicating the ticket/token number indicating the car service ticket number . This is opposed to the bike service experience of mine , at the bike service station the guy attending the customer always does this by means of scribbling the number by means of a wet chalk. Used to wonder why the car guys do not follow the same thing and why do they resort to the card board box on top of the car with a number on the box. Used to think that this was something only my car vendor service team followed. More recently went to another car service station from an another car vendor.