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===Critical path method===
Even though that the method has many advantages then there are also some disadvantages which can limit the application of using the method. The critical path method can easily be calculated by hand calculation but if any calculation is wrong or a task duration or dependency changes especially one of the early calculation then it is necessary to start all over. Luckily there have been developed many different types of softwares that can handle the calculation which solve the the mentioned issues but it gives that limitation that an IT-tool is necessary.