The origin of the critical path method, the difference between the critical chain method and the cri

Critical path method.

Difference with Critical Chain Method:

1) Both are common ways to develop schedules.

Critical Chain Method. 2) The critical chain method is a new method of invention that considers resource constraints on the basis of the critical path method. The critical path method does not consider resource constraints, and the critical chain method considers resource constraints, which is the most fundamental difference between Fengqing. The resource-constrained critical path is the critical chain.

3) The critical path method reserves security time for each activity, and the critical chain method removes these security times and sets a buffer time allocated on demand.

Critical path method.

4) The critical path method can make the most accurate schedule and implement it with the least deviation when the resources are unlimited. When resources are limited, the critical chain method overcomes the inertia of resources engaged in each activity, ensures that the project moves forward, and reserves a total buffer time, which has significant project promotion value.

The critical path method is a method to estimate the minimum completion period of a project and determine the schedule flexibility of the logical network path in the preparation of schedules. This progress network analysis technique calculates the earliest start, early end, latest start, and latest end dates for all activities by extrapolating backwards and backwards along the progress network path without considering any resource constraints.

The project manager should pay attention to the change in the total float time, as if the total float time is small, it means that the activity is delayed, or the activity is delayed immediately before the activity.

Summary. The critical path approach focuses on the control of fees and costs; The program review technique takes into account a large number of uncertainties, with an emphasis on time control.

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The critical path approach focuses on the control of fees and costs; The program review technique takes into account a large number of uncertainties, with an emphasis on time control.

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There are four differences between the critical path method and the critical chain method:

1. The two definitions are different:

1. Critical path method: refers to the logical path with the longest delay from input to output in the design. Optimizing the critical path is an effective way to increase the speed of design work.

In general, the delay from input to output depends on the path with the maximum delay traveled by the signal, regardless of other paths with low delay.

The critical path method can be used repeatedly during the optimization design process until it is impossible to reduce the critical path delay. The synthesizer and design analyzer in the EDA tool typically provide critical path information so that the designer can improve the design and increase the speed.

2. Critical chain method: It is a schedule network analysis technology, which can adjust the project schedule according to limited resources. The critical chain approach combines deterministic and random approaches.

Start by using the estimation of the duration of activities in the schedule model, plot the project schedule network based on the given dependencies and constraints, and then calculate the critical path.

Once the critical path has been identified, the resource constraint schedule is determined, taking into account the availability and availability of resources. This resource-constrained schedule often changes the critical path of the project.

Second, the origin of the two is different:

1. Origin of the critical path method: The critical path method was invented by DuPont.

2. The origin of the critical chain method: The critical chain is a project management method based on the theory of constraints proposed by Dr. Goldratt.

Third, the advantages of the two are different:

1. Advantages of the critical path method: The critical path method is mainly a kind of network diagram based on single-point time estimation and strict order. Its appearance provides important assistance to the project, especially the graphical display of the project and its main activities, and these quantitative information provide an extremely important basis for identifying potential project delay risks.

2. Advantages of the critical chain method: One of the benefits of the management of the critical chain method is to complete the project ahead of schedule. It is usually at least 1 3 times ahead of the critical path method.

Rather than the traditional project management, it is necessary to regularly record the progress of each task, analyze deviations, and track the progress of the project.

With the critical chain method, we only need to focus on those projects and work that have been postponed, and if the work is carried out within the normal range, it can be placed in a slightly secondary position in the management work. At the same time, the standby management of the project and the overall progress of the project are managed and controlled.

Fourth, the work arrangements of the two are different:

1. The critical path method is to start the work as early as possible, as far in advance as possible.

2. The work arrangement of the key chain method is to postpone as much as possible.

Both the critical path approach and the critical chain approach are tools for developing project schedules, and conceptually speaking, the critical path approach refers to the time period in which each activity can be carried out without considering any resource constraints, given the duration of the activity, the logical relationship, the amount of time lead, the amount of time lag and other constraints, which is a sequence of activities consisting of individual activities with a total time difference of 0 or negative. The critical path method is a time-constrained progress network analysis tool, and the application of the critical path method can make the work schedule start as early as possible.

The critical chain method is a schedule model formulated in line with the resource situation after considering resource constraints, and is characterized by reserving buffer time for resource risk concentrations that affect progress. The duration of the activity is first estimated with a definite estimate (critical path method) and then with a probabilistic estimation (to reduce the probability of completion of the activity duration), and after the critical path is determined, the availability and quantity of resources are taken into account to determine the resource constraint schedule. This resource-constrained schedule often changes the critical path of the project.

The theoretical basis for the critical chain method is Parkinson's law. Parkinson's Law states that work is always delayed until the day it allows.