Release Burn Down Bar Charts Questions

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SriM
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Release Burn Down Bar Charts Questions

Postby SriM Mon Sep 29, 2014 9:50 am

Hi,

I have the following queries with respect to Release Burn Down Bar Charts. Please confirm whether my understanding is correct?

1. In release burndown bar chart, whenever work gets added, bottom is lowered in the sense, before adding the scope if the bar is at -20, once the scope is added the bar would be at -40 (negative value gets increased)?

2. Similarly if the bar is at -50 before scope is removed and once scope is removed, bar is raised in the sense that bar would be at -10?

3. At the start of the project, bar would be at zero?

4. Total length of the bar represents the amount of work remaining --> Total length of the bar representing all iterations on the horizontal axis?

5. Top bar would be raised, only when we do reestimation of the scope --> Top bar raised in the sense initial bar value changes from 30 to 50. Is this understanding correct?

5a. Why reestimation of scope impacts velocity (top side of the bar)?

Thanks
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saket
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Re: Release Burn Down Bar Charts Questions

Postby saket Mon Sep 29, 2014 11:32 am

Your understanding is right in most cases.

4. Total length of the bar represents the amount of work remaining --> Total length of the bar representing all iterations on the horizontal axis?


The total length is not across horizontal it is one vertical bar, so like if the top bar point is 50 and lower is at -30 the total work pending at that instance os 50+30 = 80
5. Top bar would be raised, only when we do reestimation of the scope --> Top bar raised in the sense initial bar value changes from 30 to 50. Is this understanding correct?

5a. Why reestimation of scope impacts velocity (top side of the bar)?


In the instance of re-estimation we loose the velocity info from this chart, so at that case the bar will not reflect the velocity.
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Re: Release Burn Down Bar Charts Questions

Postby SriM Mon Sep 29, 2014 2:57 pm

Thanks Saket. PFB the clarifications.

<Sri>
4. Total length of the bar represents the amount of work remaining --> Total length of the bar representing all iterations on the horizontal axis?

<Saket>
The total length is not across horizontal it is one vertical bar, so like if the top bar point is 50 and lower is at -30 the total work pending at that instance os 50+30 = 80

<Sri>
Release consists of several iterations. If we consider it vertically, which iteration's upper and lower values has to be chosen. Also while calculating total work pending is upper value - lower value? or upper value + lower value (ignoring the sign).

Suppose if there are 5 iterations in a release and the largest top value of one of the iterations is 60 and its respective lowest value is -20, but the overall lowest value is -40 (another iteration has upper value as 30, whereas lower value as -40, in that case total work remaining is 60+20 or 60+40. This is my assumption. Please clarify.

5a. Why reestimation of scope impacts velocity (top side of the bar)?

In the instance of re-estimation we loose the velocity info from this chart, so at that case the bar will not reflect the velocity.

In the lesson it is mentioned as top bar can only be raised when we do reestimation.
In case of re-estimation, would only top bar be raised won't it be lowered. I hope the reestimation could result in decreasing size as well, in that case won't be lowered rather than raised.

5. Top bar would be raised, only when we do reestimation of the scope --> Top bar raised in the sense initial bar value changes from 30 to 50. Is this understanding correct?

<Sri>
Is the above understanding correct?
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saket
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Re: Release Burn Down Bar Charts Questions

Postby saket Mon Sep 29, 2014 3:43 pm

Total length of last bar represent the work renaming , since it is cumulative, please draw it along with burn down chart. when we have new bar it mean we have new iteration and each bar represent status as of now. and we are only talking about total work left.

DSC_0180.jpg
DSC_0180.jpg (37.42 KiB) Viewed 2890 times



on estimation, you are right, in general we usually increase the size by re-estimation but yes in case it reduces the top comes down.
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SriM
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Re: Release Burn Down Bar Charts Questions

Postby SriM Tue Sep 30, 2014 9:44 am

Got it. Thanks
SriM
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Total length - Release burn down bar chart

Postby SriM Tue Sep 30, 2014 1:42 pm

In the attached example, last bar’s top bar ends at 120 and the bottom bar ends at +20. In this case, total length of the bar is 120+20=140 or 120-20=100.
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release_burndown_chart_totallength.png
release_burndown_chart_totallength.png (54.78 KiB) Viewed 2885 times
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saket
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Re: Release Burn Down Bar Charts Questions

Postby saket Tue Sep 30, 2014 3:29 pm

it would be 100 , since we only want to know what is remaining.
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Re: Release Burn Down Bar Charts Questions

Postby SriM Tue Sep 30, 2014 5:33 pm

Thank you

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