## Release Burn Down Bar Charts Questions

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SriM
Beginner
Posts: 37
Joined: Mon Sep 29, 2014 4:08 am

### Release Burn Down Bar Charts Questions

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
saket
Posts: 3114
Joined: Sat Dec 07, 2013 10:37 pm

### Re: Release Burn Down Bar Charts Questions

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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SriM
Beginner
Posts: 37
Joined: Mon Sep 29, 2014 4:08 am

### Re: Release Burn Down Bar Charts Questions

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?
saket
Posts: 3114
Joined: Sat Dec 07, 2013 10:37 pm

### Re: Release Burn Down Bar Charts Questions

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 (37.42 KiB) Viewed 3940 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
Beginner
Posts: 37
Joined: Mon Sep 29, 2014 4:08 am

### Re: Release Burn Down Bar Charts Questions

Got it. Thanks
SriM
Beginner
Posts: 37
Joined: Mon Sep 29, 2014 4:08 am

### Total length - Release burn down bar chart

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.
Attachments
release_burndown_chart_totallength.png (54.78 KiB) Viewed 3935 times
saket
Posts: 3114
Joined: Sat Dec 07, 2013 10:37 pm

### Re: Release Burn Down Bar Charts Questions

it would be 100 , since we only want to know what is remaining.
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SriM
Beginner
Posts: 37
Joined: Mon Sep 29, 2014 4:08 am

Thank you