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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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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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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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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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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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

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