For us Engineers, the word 'design' or rather, 'Engineering design' invariably means a technically evaluated compromise between integrity and economy of an entity for creation. In other words, we try to balance the cost of creation with the stability, strength and durability of the entity being designed. However, at the level of the users, additional requirements which are more general, though subjective, comes in to play such as aesthetics, functionality in terms of user friendliness and positive feel.