什么是系统工程（字幕）09
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那第一个描述的就是使命声明了
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那么内容在这里，它列了一个表格
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在这里
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你看，一条一条的需求表达出来
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然后这是ID，名称
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文本
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那么
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画图就画在这个需求图里面了
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建一张需求图
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然后画在这里
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那么这个内容呢
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我把它翻译成了中文
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在这里，我们一会儿拷进去就行，不打字了
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那下面我们就来画一下
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这个需求图怎么画
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你看
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它是在这个包下面，使命声明这个包下面
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然后这个图是
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它用了这个词，解构
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这个需求
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也就是说
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它没有用需求分解
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那书里面也讲了
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它也解释了一下
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说为什么不用分解
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因为分解是那个
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平行的
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不增加，不改变含义的
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同一个层级的
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这样把它切开
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解构呢
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书里没说
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为什么要用这个词
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我们只能说
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揣摩它的意思，应该就是说它不是一个抽象级别的
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比如说，怎么个不是一个抽象级别的
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你看这里
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它并不是简单的分解
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而是什么
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通过问为什么
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怎么样
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为什么不
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找到问题的原因
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问题的解决方案
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这么几个级别跳来跳去
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所以呢，不能叫分解
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因为
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解决方案不是问题的分解
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对不对
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原因也不是问题的分解
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对吧
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它们都不是一个级别的
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但如果说，问题有子问题，这种是分解
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你看这里
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有污染的水源、净化器需要
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但又不是过滤器
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对吧
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这相当于一开始列了一些条件了
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所以呢，你看，它决定就有这个经济的过滤器（应为蒸馏器）
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这个
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那下面这个就可以认为是什么
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可以认为是
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是这一条的分解
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这一条的分解，5.1, 5.2这个
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但是，你看，这个可以看作是一个推导的过程
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对吧
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推导的一个过程
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那下面我们来画一下
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怎么画
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你看，在使命声明这里
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添加一个
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需求图
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那个图的名字叫什么呀
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那我们就按照这个来
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解构需求，对吧
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我们就按照这个，解构需求
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好
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你看，刚好对照过来
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对吧
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既然这个图里面
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示意的是这个
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我们就先画这个5这个好了
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先画5这个
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怎么画
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需求在这里嘛
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对吧
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放上一条
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然后它名字叫什么
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我们把那个文本
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这里
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把这个删掉
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你看，我们这里是经济的过滤器（应为蒸馏器）
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名字是这个
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那么它的ID
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和这个放哪里呢
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ID是这个
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ID放哪里
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ID在这里
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这个地方是给SysML专用的
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copy进去，文本就这个了
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在这里copy
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粘贴
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好
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这是一个了
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下一个
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5.1
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简单
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不是，5.1
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是这个
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名字是简单蒸馏器
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你看这个
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客户想，一大堆这个
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好
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下一条
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5.2
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ID是这个
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名字项目范围（1）
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文本是这个
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好
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得到了3条
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需求，对吧
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那我们看，对照一下这里
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3条
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那怎么把它显示出来呢
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把ID这些显示出来
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跟这个一样
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跟这个图一样
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要把这个ID，还有那个
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文本显示出来
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那右键点这个图
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Properties这里
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elements
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这个tag这里
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因为刚才那个ID什么是它的一个扩展的
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扩展的一个栏，在这里
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把这个选上
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你看，就出来了
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对吧
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缩小一点
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放大一点
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如果你地方不够大了
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你可以把它隐藏起来
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隐藏起来
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好
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我们可以对比一下
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5.1是吧
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text等于这个
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5.2，text等于这个
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ID，MS.5
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这里
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这样对照过来，经济的过滤器（应为蒸馏器）
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那这里就有一个十字这个
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这是一个
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包含，或者嵌套的一个关系
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那么这个怎么画
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你可以在这里
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你看，那个圈圈在这里
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也可以
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你在这里
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这样画上去
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然后这里，选这个
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就有个圈出来
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也可以从这里选
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对吧
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也可以从这里选
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这样画上来，也可以
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哎哎
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反了
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这里选，这样画上来
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那怎么把它变成一棵树
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就改变这个线的风格
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这里
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这样来
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这样来
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这就是那个
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幻灯片示意图上
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那个图嘛
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对吧
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那其他的
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我们就
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在这个演示里面就不放进去了
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否则时间太多了
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对吧
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我们就把它做好了
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再演示出来