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A thorough gathering of requirements should include the following questions: What should the system do? But also… What could it do? What must it do? What must it not do? Nice piece of advice borrowed from my dark (hard-core engineering) past, who would have thought it’d turn out to be so useful in design.
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"We have limited resources," he says. "Everything we spend has to be financed and the interest paid. A dollar spent inefficiently is a dollar too much. Changes to entitlements tend to stick. A bridge can be built in the wrong place. These are long-term decisions that affect the budget baseline for years to come."