Does a paragraph have to be a relation? If not, are book(5th paragraph) and hire(4th paragraph) allowed to be designed with the same relationship? In addition, if there are attributes not mentioned in this paragraph, can I add them myself? For example: There is no mention of the need to record the fuel consumption type of the vehicle in the first paragraph, but in the fifth paragraph of the booking, it is mentioned that this attribute is required. Does that mean that I should add the fuel consumption attribute to the Car table in the first paragraph? If not, does this mean that each vehicle make can only represent one fuel consumption type? (Because it seems that only the car make is related to the car in the first section) Also, depots do not have attributes to connect to the cars in the first segment. Should we record the car IDs in each depot?