How Analogous Estimation a Top-Down Estimation???

[Rishun Gupta]

Folks,

I have this question/doubt/confusion :: what makes Analogous Estimation a Top-Down Estimation Type???

Can someone please clear me out, tried googling it but didn't get a significant answer...

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-Rishun Gupta
Project Manager
A-1 Technology Pvt Ltd.
Mob:9815972620
rishun...@a1technology.biz
ris...@gmail.com

[santosh a.s]

Hi Rishun,

 

As Analogous Estimation is purely based on Historical Records and Expert Judgment, where we are performing the same / similar kind of project.

It can be assumed in Analogous Estimation as waste of time in re-inventing the wheel and using the same set of previous Project Documents/Experience for current projects.

Regards,

Santosh 

[Rishun Gupta]

Hi Santosh

I agree to/aware of that Analogous Estimation is based on Historical Information but how does that makes it Top to Bottom Technique and not a Bottom Up Technique...

Best

-Rishun

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[DHIRAJ KALRA]

In bottom-up estimating, first you break down the project into activities and then add them up. and In analogous estimation since you are comparing the project as a whole with a similar project, you are doing top-down estimations.

Hope that clear your doubt. 

Dhiraj Kalra

[Rishun Gupta]

This makes sense to me for sure... But when we compare the project as a whole we will certainly be comparing the scope and decomposed Deliverables and activities decomposed from those deliverables as well... right?? So this attributes the same as Bottom-UP Estimation...

Thanks for Replying...

-Rishun

[DHIRAJ KALRA]

Let's try to understand with couple of examples where we apply analogous estimating:

a. Suppose you are awarded a construction project and you have already done similar project two years back, so you won't create activities again in this case, rather refer the historical data as it is. Only change will be in costing or technology used at that time,

b. Suppose you have a SAP implementation project, so steps involved is already defined and you just do analogous estimations. But if further customization is required, then you need to do effort estimates and costing for that.

[Rishun Gupta]

Agreed, Now this is clear to me...

Thanks Alot

-Rishun

[Kimberly Stringfellow]

On Thu, Jun 23, 2011 at 1:31 PM, DHIRAJ KALRA <kalra...@gmail.com> wrote:

In bottom-up estimating, first you break down the project into activities and then add them up. and In analogous estimation since you are comparing the project as a whole with a similar project, you are doing top-down estimations.

 

I would add that bottom-up estimating is generally performed by the "owner"/team member that has been assigned the task and analogous estimating is generally performed by management, if you will; since we are utilizing lessons learned from similiar similar project/s.
 
Kimberly 

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Date: Thu, 23 Jun 2011 14:51:11 +0530
Subject: Re: How Analogous Estimation a Top-Down Estimation???
From: rishun...@a1technology.com
To: pmp-cert-onli...@googlegroups.com