软件设计之度
DESCRIPTION
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dù
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简,简,朴。朴。
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精,精,妙。妙。
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简洁,低成本,易实现。
完善,灵活,强大。
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设计的首要目标:解决问题,满足需求
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度的衡量:设计方案所解决问题之广度
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奥卡姆剃刀
如无必要勿增实体
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问题:广度↑方案:抽象程度↑ 复杂程度↑
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设计合适之度:成本与效用之平衡
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Just enough design
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solution
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solutionFAIL
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适合的场景:•需求稳定•完全不能预见需求变化方向•成本 / 时间限制
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预留了一定灵活性的设计
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solution
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过度设计
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solution
?
?
?
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为未来多做一点没有坏处?
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成本浪费在解决虚幻的问题上
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解决问题之广度增加方案的抽象程度增加
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LEGOLEGOcancanbuildbuildanythinganything
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未明确的需求
不能建立合理的模型
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?
FAIL
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修改?保持前向兼容!
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不要过度自信
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不因为可以做而做要因为需要做而做
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存活下来的物种,既不是那些最强壮的,也不是那些智力最高的,而是那些最适应于
变化的
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敏捷的价值观:拥抱变化
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可进化的设计方案
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进化新需求小
步设
计
反思
重构
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必不可少的重构
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新需
求
设计
新需
求
设计
新需
求
设计
腐化