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"No matter what kind of software you write, no matter what size company you work for, you probably have to provide estimates to someone. They may want to know how long the effort will take or how much it will cost. But no matter how you slice it, estimation is critical skill and essential to the success of any software development effort of any size or consequence."

"The traditional Waterfall model fits nicely with the way companies buy things: the requirements are drawn up, a supplier quotes a price (based on their interpretation of the requirements and estimates of cost) and everyone signs a legally binding agreement."