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The Critical Path Method, abbreviated CPM, or critical path analysis, is a mathematically based algorithm for scheduling a set of project activities. It is an important tool for effective project management. Image File history File links Broom_icon. ...
Flowcharts are often used to graphically represent algorithms. ...
Project Management is the discipline of organizing and managing resources (e. ...
It was developed in the 1950s in a joint venture between DuPont Corporation and Remington Rand Corporation for managing plant maintenance projects. Today, it is commonly used with all forms of projects, including construction, software development, research projects, product development, engineering, and plant maintenance, among others. Any project with interdependent activities can apply this method of scheduling. This article is about E.I. du Pont de Nemours and Company. ...
A Remington Rand branded typewriter Remington Rand was an early American computer manufacturer, best known as the original maker of the UNIVAC I, and now part of Unisys. ...
Computer software (or simply software) refers to one or more computer programs and data held in the storage of a computer for some purpose. ...
The essential technique for using CPM is to construct a model of the project that includes the following:
- A list of all activities required to complete the project (also known as Work breakdown structure),
- The time (duration) that each activity will take to completion, and
- The dependencies between the activities.
Using these values, CPM calculates the longest path of planned activities to the end of the project, and the earliest and latest that each activity can start and finish without making the project longer. This process determines which activities are "critical" (i.e., on the longest path) and which have "total float" (i.e., can be delayed without making the project longer). In project management, a critical path is the sequence of project network activities which add up to the longest overall duration. This determines the shortest time possible to complete the project. Any delay of an activity on the critical path directly impacts the planned project completion date (i.e. there is no float on the critical path). A project can have several, parallel, near critical paths. An additional parallel path through the network with the total durations shorter than the critical path is called a sub-critical or non-critical path. // One of the most important WBS design principles is called the 100% Rule. ...
In a project network, a dependency is a link amongst a projects terminal elements. ...
Project Management is the discipline of organizing and managing resources (e. ...
A project network is a graph (flow chart) depicting the sequence in which a projects terminal elements are to be completed by showing terminal elements and their dependencies. ...
Duration of a projects terminal element is the number of calendar periods it takes from the time the execution of element starts to the moment it is completed. ...
Float in project management is the amount of time that a terminal element in a project network can be delayed by, without causing a delay to: subsequent terminal elements (free float) project completion date (total float). ...
These results allow managers to prioritize activities for the effective management of project completion, and to shorten the planned critical path of a project by pruning critical path activities, by "fast tracking" (i.e., performing more activities in parallel), and/or by "crashing the critical path" (i.e., shortening the durations of critical path activities by adding resources).
Originally, the critical path method considered only logical dependencies between terminal elements. Since then, it has been expanded to allow for the inclusion of resources related to each activity, through processes called "activity-based resource assignments" and "resource leveling". A resource-leveled schedule may include delays due to resource bottlenecks (i.e., unavailability of a resource at the required time), and may cause a previously shorter path to become the longest or "resource critical" path. A related concept is called the critical chain, which attempts to protect activity and project durations from unforeseen delays due to resource constraints. In a project network, a dependency is a link amongst a projects terminal elements. ...
Critical Chain Project Management (CCPM) is based on methods and algorithms developed in 1997 by Eliyahu M. Goldratt. ...
Since project schedules change on a regular basis, CPM allows continuous monitoring of the schedule, allows the project manager to track the critical activities, and alerts the project manager to the possibility that non-critical activities may be delayed beyond their total float, thus creating a new critical path and delaying project completion. In addition, the method can easily incorporate the concepts of stochastic predictions, using the Program Evaluation and Review Technique (PERT) and event chain methodology. PERT network chart for a seven-month project with five milestones (10 through 50) and six activities (A through F). ...
Event chain diagram Event chain methodology is an uncertainty modeling and schedule network analysis technique that is focused on identifying and managing events and event chains that affect project schedules. ...
Currently, there are several software solutions available in industry that use the CPM method of scheduling, see list of project management software. However, the method was developed and used without the aid of computers. The following is a list of notable project management software applications. ...
A schedule generated using critical path techniques often is not realized precisely, as estimations are used to calculate times: if one mistake is made, the results of the analysis may change. This could cause an upset in the implementation of a project if the estimates are blindly believed, and if changes are not addressed promptly. However, the structure of critical path analysis is such that the variance from the original schedule caused by any change can be measured, and its impact either ameliorated or adjusted for. Indeed, an important element of project postmortem analysis is the As Built Critical Path (ABCP), which analyzes the specific causes and impacts of changes between the planned schedule and eventual schedule as actually implemented.
Literature - Project Management Institute (2003). A Guide To The Project Management Body Of Knowledge, 3rd ed., Project Management Institute. ISBN 1-930699-45-X.
- Klastorin, Ted (2003). Project Management: Tools and Trade-offs, 3rd ed., Wiley. ISBN 978-0471413844.
- Heerkens, Gary (2001). Project Management (The Briefcase Book Series). McGraw-Hill. ISBN 0-07-137952-5.
- Kerzner, Harold (2003). Project Management: A Systems Approach to Planning, Scheduling, and Controlling, 8th Ed., Wiley. ISBN 0-471-22577-0.
- Lewis, James (2002). Fundamentals of Project Management, 2nd ed., American Management Association. ISBN 0-8144-7132-3.
- Lev Virine & Michael Trumper (2007). Project Decisions: The Art and Science. Management Concepts. ISBN 978-1567262179.
- Milosevic, Dragan Z. (2003). Project Management ToolBox: Tools and Techniques for the Practicing Project Manager. Wiley. ISBN 978-0471208228.
- Woolf, Murray B. (2007). Faster Construction Projects with CPM Scheduling. McGraw Hill. ISBN 978-0071486606. Critical Path method
See also The following is a list of notable project management software applications. ...
Aggregate planning Agile software development Critical path method Critical chain Cost overrun Dependency Duration (project management) Dynamic Systems Development Method Earned Schedule Earned value management Estimation Estimation in software engineering Event chain diagram Event chain methodology Extreme project management Float (project management) Focused improvement Fordism Gantt, Henry Gantt chart Goal...
PERT network chart for a seven-month project with five milestones (10 through 50) and six activities (A through F). ...
A project is a temporary endeavour undertaken to create a product or service[1]. // The word project comes from the Latin word projectum from projicere, to throw something forwards which in turn comes from pro-, which denotes something that precedes the action of the next part of the word in...
Project Management is the discipline of organizing and managing resources (e. ...
Project planning is part of project management, which relates to the use of schedules such as Gantt charts to plan and subsequently report progress within the project environment. ...
// One of the most important WBS design principles is called the 100% Rule. ...
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