PMP培训项目进度网络图

外部项目活动和非项目活动之间的依赖关系，往往不再像团队的控制范围内，内部项目活动之间的紧前关系，这四种依赖关系两两又可以组合，强制性，外部强制性，内部选择性，外部选择性内部提前量与滞后量，提前量。

箭线绘图法又叫双代号，网络图只能表示完成到开始一种逻辑关系。它是拿节点表示事件箭头代表活动，它的特点是有虚箭线，虚箭线不消耗时间，不消耗资源，只能表示逻辑关系，它和单代号网络图可以相互转化，确定和整合依赖关系。

项目进度网络图项目文件更新第四个过程，估算活动持续时间，它属于进度管理知识领域规划过程组，过程定义是估算完成各项活动所需工作时段数，它有四个输入，项目管理计划，项目文件，事业环境因素，组织过程资产用到八个工具。 

强制性的选择性的外部内部强制性，它是有法律合同客观限制条件所决定又叫硬逻辑。比如先报名了才能考试，选择性基于具体应用领域的实践，又叫逻辑优先逻辑。比如走路的时候先迈左脚还是先迈右脚，这都无所谓，每个人都有自己的实践。 

相对于紧前活动紧后活动可以提前的时间量，比如出差前五天可以订票，五天就是提前量。滞后量。相对于紧前活动紧后活动需要推迟的时间量，比如上课后两天开始复习，两天就是滞后量得到两个输出。

Mandatory selective external internal compulsory, which is determined by the objective constraints of legal contracts, also called hard logic. For example, if you sign up before you can take the exam, the choice is based on the best practices of the specific application domain, also known as the preferred logical priority logic. For example, when you walk, you must first move your left foot or take your right foot first. It doesn't matter. Everyone has their own best practices.

The amount of time that can be advanced in advance of the activity immediately after the activity, such as five days before the trip can be booked, five days is the amount of advance. The amount of lag. Compared with the amount of time that the activity needs to be postponed immediately after the activity, for example, two days after class, the two-day lag will get two outputs.