The levels of detail are very important when creating BIM objects. There are generally three levels that products need to match, from a very basic outline (so if a manufacturer is producing a radiator, it could just be a box on a wall) to a fine level (again taking the radiator as an example, a manufacturer could produce an accurate shape and size with fixing brackets and pipe connections). A manufacturer needs to make sure the levels of detail for the object are designed to match the correct level of detail within the design programme and change to suit what the designers want to do with the object at the time. For example, designers don’t want to see all the connections and brackets if it’s just an initial concept design, they just want to see the rough shape and size. However, as mentioned before, don’t forget to keep the file size low!