The real difference between the waterfall and the iteration

Waterfall Model:

　　Emphasizing the overall advancement and the stage Division

Requirements--design, implementation of->...-> test--delivery,

Project resources (Time manpower funds, etc.) are allocated by phases

The outputs of each phase are inputs to the next phase.
Iterative models:

Emphasizing individual propulsion and functional Division

Sub-function 1-> sub-function 2->...-> sub-function n

Project resources are assigned by sub-function

Complete a molecule function on each order

The real difference between the waterfall and the iteration