☛ The amount of code that has to be dealt with is reduced thus easing the overhead and redundancy is eliminated in case if there is anything common among the functions.

☛ Memory allocation is another aspect that is optimized and it also makes sense to group a set of functions related in some way as one single unit rather than having them to be dispersed in the whole program.

☛ In case of interactive systems display of menu list and reading in the choices of user's could be encapsulated as a single unit.