BIM software allows architects to assemble every piece of a building from a kit of parts, for the first time designers can see every part of the building put together before they start construction. This ability to plan ahead can help solve some problems but can also lead to a false sense of security. Each building is a unique project and how it is put together is also unique. In theory with BIM you can have all the parts built before the project is put together. This would save time and money, but if there was a mistake with one of the parts the others may not fit. In the past if something wasn’t made perfectly the next part could be altered to fit. BIM may be a computer program but it is still operated by people and people make mistakes. The users of this software must be careful not to rely too much on the software.