What is the difference between CPM and PERT?

What is the difference between CPM and PERT?

PERT is a technique of planning and control of time. Unlike CPM, which is a method to control costs and time. PERT technique is best suited for a high precision time estimate, whereas CPM is appropriate for a reasonable time estimate. PERT deals with unpredictable activities, but CPM deals with predictable activities.

What are all the applications of PERT and CPM?

The techniques of PERT and CPM help greatly in completing the various jobs on schedule. They minimise production delays, interruptions and conflicts. These techniques are very helpful in coordinating various jobs of the total project and thereby expedite and achieve completion of project on time.

What is PERT and CPM PDF?

CPM/PERT or Network Analysis as the technique is sometimes called, developed along two parallel streams, one industrial and the other military. CPM (Critical Path Method) was the discovery of M.R. The first test was made in 1958, when CPM was applied to the construction of a new chemical plant.

What is critical path and project duration in Pert CPM?

Critical Path’s main feature is the way it calculates the shortest project duration possible by lining up the longest sequence of dependent tasks necessary to complete the project. The main difference between PERT and Critical Path is knowing how long a given task will take.

What is expected project length?

The expected length of the entire project denoted by Te is the length of the critical path (i.e.) the sum of. the, te’s of all activities along the critical path. In the same way, the variance of a sum of independent activity times is equal to the sum of their individual. variances.

How do you calculate minimum completion time?

You calculate your minimum float time by deducting the project duration from the difference between your late start date and early finish date.

What is minimum completion time?

What is the minimum completion time? The shortest time a project can be completed is called the minimum completion time.

What is completion time?

Time to completion (TTC) is a calculated amount of time required for any particular task to be completed. Completion is defined by the span from “conceptualization to fruition (delivery)”, and is not iterative. Similar to the metaphorical use of estimated time of arrival.

How do you calculate completion time?

The Turnaround time and the waiting time are calculated by using the following formula.

1. Turn Around Time = Completion Time – Arrival Time.
2. Waiting Time = Turnaround time – Burst Time.

What is critical path in project management?

The critical path (or paths) is the longest path (in time) from Start to Finish; it indicates the minimum time necessary to complete the entire project.

How do you find the critical path?

Calculating Critical Path is a simple 4-step process.

1. Step 1: Find Activities. Activities for this project are as below (output from Define Activities process) –
2. Step 2: Build Schedule Network Diagram.
3. Step 3: Find all Possible Paths.
4. Step 4: Calculate Duration for Each Path.

How do you calculate the probability of a project on time?

1. Step 1 :- For critical activity only. σ=tp−to6. Activity. T0. Tm. Tp. te=t0+4tm+tp6.
2. Step 2:- Project duration = 31 days. Critical path =1-2-4-6-7-8.
3. Step 3:- The probability of completing the project in 35 days is. z = scheduled time-project durationϵ S.T.= 35 Days. P.D.= 31 Days. ϵ=√σ2=√8

Which activity is on the critical path?

Related Links. Critical path activities are the project tasks that must start and finish on time to ensure that the project ends on schedule. A delay in any critical path activity will delay completion of the project, unless the project plan can be adjusted so that successor tasks finish more quickly than planned.

What is crashing of project?

Project crashing is when you shorten the duration of a project by reducing the time of one or more tasks. Crashing is done by increasing the resources to the project, which helps make tasks take less time than what they were planned for. Of course, this also adds to the cost of the overall project.

What are the 5 common reasons for crashing a project?

Graph that plots project costs against time; includes direct, indirect, and total costs for a project over relevant time range. What are the 5 common reasons for crashing a project?…

• Time to market pressures.
• Unforeseen delays.
• Incentives for early completion.
• Imposed deadlines.
• Pressures to move resources elsewhere.

What is the first step in project crashing?

The first step is to identify which are the tasks that if we shorten them, we will also shorten the project completion. These tasks are those that are included in the critical path. Apply the CPM (Critical Path Method) to calculate the critical path and identify which are those critical tasks.

When should you stop crashing a project?

The 6 valid reasons for choosing Project crashing

1. Get the most compression on the duration of a project.
2. When the project has a fixed final date.
3. When there is a delay.
4. When the team is involved in other activities.
5. When there are more resources available.
6. When a resource needs training.

Can critical path have float?

Critical path activities can have float; hence the critical path can have float.

What is Fast Track in project management?

Fast-tracking in project management is a technique where activities are performed in parallel, instead of being carried out sequentially using the original schedule.

Which activities should be crashed?

The activity which should be crashed is the one on the critical path which will add the least amount to the overall project cost. This will be the activity with the flattest or least-cost slope. The duration can be reduced as long as the critical path is not changed or a new critical path is created.

How do you crash a project in Critical Path?

The basic process involved in generating a time-cost (crash) curve is to:

1. Define the project logic.
2. Add the duration for each activity.
3. Establish the project critical path.
4. Calculate the cost of crashing each activity.
5. Calculate the cost of crashing per unit time.
6. Calculate the most cost-effective crash sequence.

What is the main goal of crashing a project activity?

The aim of crashing is to achieve the maximum decrease in schedule for minimum additional cost. This can be done by: Addressing productivity issues being experienced by the current resources and trying to find ways of increasing their efficiency. Increasing the assignment of resources on critical path activities.

What is the difference between crashing and fast tracking?

Conclusion. In summary, the differences between fast tracking and crashing are: Fast tracking involves the performance of activities in parallel, whereas crashing involves the addition of resources to a project. In fast tracking, there is increased risk, whereas in crashing there is increased cost.