How does “Top Down Estimation” in Primavera P6 work?

In Primavera we have a function called “Top Down Estimation” which help us to calculate an estimated figure for Labor and Non-labor unit based on “estimation weights”. It can apply to WBS and Activity.

I will show you how to do it.

We have a simple project and each activity is assigned the resource “Test”. By default each activity will have 40 units.

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We will use Top Down Estimation to redistribute the unit to make it more realistic.

To perform top-down estimation, you must first assign estimation weights to WBS and activities. These estimation weights are used to determine how units are distributed among WBS and activities.

Go to WBS window. Show “Est Weight” column.

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Now we enter the weight for each WBS.

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Go to Activities window. Show “Est Weight” column.

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Now we enter the weight for each activity.

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Go to Tool -> Top Down Estimation

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Primavera show you the current units in your project. Now you will enter the new units you want to apply to your project.

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Click on Apply button.

Now you can see WBS and activities have new budgeted units.

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The units are distribute according to Est Weight which we assigned to them.

For example: Foundation get 40% of 1000 units = 400 units. Bored Pile get 70% of 400 units = 280 units.

With this function, we can quickly distribute units to activities.

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Author: Khuong Do

Khuong Do is a Project Planner in Civil, Transportation and Oil & Gas Industry. He has worked as a Primavera Consultant Specialist since 2006 . He holds a Civil Engineering degree and a Bachelor of Information Management System. Now he is working in Petronas RAPID project, one of the biggest Refinery and Petrochemical complex, in Pengerang – Malaysia.

15 thoughts on “How does “Top Down Estimation” in Primavera P6 work?”

  1. Yeah, I think it’s only for making a draft resource load.
    Especially when you already had a similar project and you will bring the estimation weight from that project to this one.

    Like

  2. Thank you
    I have a another doubt. How can we calculate the monthly expenses in primavera.
    From the resource assignment we can calculate monthly budgeted total cost, total labour cost, non labour and material also like that can we calculate for expenses also, is this possible?
    Please let me know.

    Like

      1. doduykhuong Thanks For Sharing this . Can You Please write about Function Point in Top Down Estimation

        Like

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