双代号十问，口语理解版，读读帮助理解

专业辅导

1.啥叫紧前工作、紧后工作？
就是紧挨着我前边或后边的工作。
2.啥叫工作
工作就是两个圈加一条单向虚或实箭线
3.两个圈编号大小怎么定
箭线屁股的编号一定小于箭头指向的编号
4.为啥箭线是单向的，为啥不能没箭头，为啥箭屁股的号小箭头号大，为啥不能没有箭头，为啥不能用双向箭头，为啥箭头不能有回路？
因为时间在流逝，双代号网络图一定是基于时间坐标轴编制的，你就想像一下有这条虚拟的轴，不信你就看看时标双代号，而且这条时间坐标轴的原点一定是第一项工作的最早开始时间ES1,2=0，终点的日期一定计算工期Tc。时间不能先过明天再过今天，所以箭线是单向的；你不能过了今天还是今天，所以不能没箭头；你不能过了今天，明天再拐过来过明天，今天，所以不能有双向箭头；你不能把今天、明天、后天循环过，所以不能有回路。
5. 虚箭线、波形线和实箭线的区别
实箭线代表消耗时间和资源的工作，资源就是人、材、机。
虚箭线代表一种逻辑关系，什么逻辑关系呢，就是组织和工艺关系，就是你先干啥，后干啥，虚箭线代表的虚工作不消耗时间和资源。
波形线仅用于时标双代号，为啥用波形线呢，因为他像一根弹簧，代表弹性时间，也就是自由时差。
6.啥叫关键路线
就是图上有很多条道路，都可以由起点（北京）通往终点（石家庄），这些道路包括开车去，骑驴去，走着去那走着去时间最长，那走着去就是关键路线，关键路线上的工作就是关键工作。
7.关键路线有啥用
确定总工期，比如小伙伴们都在北京，相约到石家庄喝酒，那么我们这酒啥时候能喝成呢，那就要看谁最晚到，他到的那一天便是喝酒之时，那一天就是计算总时差和自由时差的基础。
8.几个英文单词
ES，EF，LS，LF，TF，FF
前四个：Early（早），late（晚），start（开始），finish（结束），
后两个：Total（全部，总的），Free（自由的），float（浮动的）
自己组合一下吧
9.计算工期，要求工期，计划工期
其实只有计算工期是图上能算出来的，其余两个都是你的客户或者领导拍脑袋想出来的。
10.TF，FF区别
限制条件不同
时差：理解为闲蛋或者玩的时间
TF：就一个前提，不影响总工期，关键路线上的工期就是总工期，所以关键路线上的TF都是0；FF：俩前提，不影响总工期且不影响你后边工作1、2、3的最早开始时间，所以关键路线上的FF全都是0；FF的限制条件比TF多一个，所以FF最多=TF，FF一定≤TF，TF=0那FF必为0。

PM加油

灰常好。学习了。

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