In my consultancy projects i have a basic rule that i respect every time. This rule said like this: “erase every thing that you already know about the subject and ask every thing like a new born child”. In some times people think that i am stupid because they think that I must know everything that is happens in the logistic and supply chain and some questions they consider that it is stupid questions. For example: I have a small audit to a company and I ask the fleet manager how he calculate the fuel consumption for cars. And that guy look on me with a strange face and said to me: “You don’t know how you calculate the fuel consumption and you want that i lean you this? “. I said “Yes”, and he was very surprised. After 1 hour he saw that my question it was not a stupid one.