1.visualize the software as a reverse pyramid
2.the tip of the pyramid is assumed to be a target, that arrows originating from different layers
of the pyrm is supposed to hit
3.the layer near to the target is supposed to hit first
4.At the start of the development few arrows are left from the bow,after a lag all the other layers start leaving the arrows,the arrows travel down the layers and wait for its window to hit the target
5.hitting the target symbolizes module completion and delivery
6.this happens wave after wave in an iterative fashion till the entire delivery is completed
7. planning if arrows in the nearlayer is delayed and upper layer overtakes it,also window ordering is also important
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