The critical path method, or CPM, was developed by DuPont, to analyse the process of shutting down plants for maintenance, then restarting them at the end of the maintenance cycle. The process involved in this was so complicated, that the critical path method had to be developed to identify and prioritise the vital activities. Similar to a Gantt chart, the CPM provides a graphical representation of the project, and the times expected to complete each activity. However, the CPM does not fix the start and end times of each activity; rather it is used to determine the activities which fall on the critical path. The critical path is the path where all activities directly follow each other, and hence there is no idle time. As such, the length of the critical path determines the total time taken for the project.
The main difference between CPM and the Gantt chart is that
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 Considering life, time is a unit of measurement since all events occur within its intervals. In fact, no two recurrent activities in history can be absolutely described without due reference to it. For instance, when intercontinental events such as the Olympics, Fédération Internationale de Football Association (FIFA) world cup and Wimbledon are occur repeatedly in the same location, they are mainly referenced based on their years or dates of occurrence. Again, time is generally an independent resource which we spend and can never retrieve –we can only attempt to compensate for it presently or in future. Therefore, in achieving project objectives and producing deliverables, time is a critical constraint to which all human resource must be sensitive.
[1]When customers, sponsors and other stakeholders outside an active project team appraise the team or their projects highly, they often adjudge them ba
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 According to Rachel Burger, senior manager of Capterra Construction the critical path is just a fancy way of saying, ‘How long does each task take before you can finish the project’. In theory, critical path method is used to estimate the minimum project duration, schedule flexibility and network path. In more simple way, “Some of the activities must happen in parallel. That is to say, if you tried to make a fried breakfast by doing one task at a time, and one after the other, things would go wrong. Certain tasks must be started before others, and certain tasks must be completed in order for others to begin. The plates need to be warming while other activities are going on
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 There are many people around us who failed on the halfway of their life just because of not being aware of exactly what work has to be done before they start to accomplish it. In general, those people concentrate more on final goal and the ways toward it which result in missing the big picture and the meaning of working on that aim. In business world, managers have a collection of team members, and they need to realize and explain exactly what they’re going to do before taking an action. Therefore, when the team start the any kind of project, members and manager should have a
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 The network diagram consists of many paths, and the characteristics of ones are that they are starting from one point and finishes in another point. These paths are differentiated from each other because of their durations, and the one that lasts the longest period is named the critical path method. The critical path method is a step-by-step project management technique for process planning that defines critical and non-critical tasks with the goal of preventing time-frame problems and process bottlenecks. (1)
The application of the critical path method consists of several steps:
- Define the required tasks and put them down in an ordered list.
- Create a flowchart or other diagram showing each task in relation to the others.
- Identify the critical and non-critical relati
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