Fig. 1. The completed van

An assembly uses single components designs that have already been created and assemble them together. This is a very efficient way of producing complex designs as it means individual components can be worked upon separately which keeps the working area uncluttered. In the van where a number of similar components are used, two axles and four wheels, each item need only be created once. Copies of the original are used in the assembly. An important feature of this type of software is that if the original components are subsequently changed those changes will immediately be reflected in the final assembly in which they are used.

Fig. 2. The fist component added to the assembly