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Pawel Brodzinski on Software Project Management

Why Burn-up Chart Is Better Than Burn-down Chart

Why Burn-up Chart Is Better Than Burn-down Chart post image

The other day I was in the middle of discussion about visuals a team was going to use in a new project. When we came to the point of tracking completion of the project I advised a burn-up chart and intended to move on. The thing that stopped me was the question I was asked: why burn-up and not burn-down?

Burn-down Chart

First, some basics. Burn-down chart is an old idea I’ve learnt from Scrum. It is a simple graph showing amount of work on a vertical and timeline on a horizontal axis. As time progresses we keep track how much work is still not done. The goal is to hit the ground. The steepness of the curve can help us approximate when it’s going to happen or, in other words, when we’re going to be done with the whole work.

When we think about quantifying work it should be anything we use anyway – story points, weighted T-shirt sizes, simple number of tasks or what have you.

Burn-up Chart

Burn-up chart’s mechanics is basically the same. The only difference is that instead of tracking how much work is left to be done, we track how much work we’ve completed, so the curve is going up, not down.

The Difference

OK, considering these two work almost identically, what’s the difference? Personally, I don’t buy all the crap like “associations of the word burn-down are bad.” We learned not to be afraid of failure and we can’t deal with a simple word? Give me a break.

The real difference is visible when the scope changes. If we suddenly realize we have more work to do burn-down may look like this.

Unfortunately, it can also look differently if we happen to be (un)lucky enough to complete some work at the same time when we learn about additional work.

It becomes even trickier when the scope decreases.

Have we just completed something or has a client cancelled that feature which we talked about yesterday? Not to mention that approximating the finish of work becomes more difficult.

At the same time, burn-up chart makes it all perfectly visible as progress is tracked independently on scope change.

You can see scope changes in both directions, as well as real progress. And this is exactly why choosing burn-up over burn-down should be no brainer.

in: project management

16 comments… add one

  • Steven Hoober October 11, 2012, 2:35 pm

    Used both.

    As long as they are on the wall, and the business owners (the Adders Of Scope) are physically present, there /seems/ to be reluctance to change scope. Zero is zero. Now, if we just build forever upward, what’s the harm in Just One More Feature…

    Also, I hear, some psychology about completion satisfaction. Up (goal lines notwithstanding) is ever upward, and the work will never be done. Down to zero is an achievable goal.

  • Pawel Brodzinski October 11, 2012, 3:10 pm

    @Steven – Reaction to adding Just One More Feature is pretty simple. Basing on your approximated future curve you can instantly say how much time it costs to add it.

    Then, there is the goal. With burn-down the goal is crossing the x axis. In burn-up it is crossing scope line. You don’t go till the infinity.

    And when you are on psychology, I know (close to) nothing about that, but I bet you will find evidence than going up with the curve gives you more satisfaction than going down. Not that I treat it as a real argument in this discussion — it is exactly the part of the dispute that I don’t buy.

  • Anton October 11, 2012, 4:35 pm

    Burning down focuses on work remaining while burning up emphasises on performance. My personal preference is work remaining as thus the team stays aware of scope changes and is likely to advise against it while focusing on performance encourages the thinking that it’s alright to taken on more work as long as we keep doing X work per work.

  • Thierry October 11, 2012, 5:18 pm

    Thanks for the entry as I am really interested in this up vs down article because it keeps coming back in team discussions. What are you tracking on the vertical, Story points estimated and story points completed? If so, I get it but I find it more useful for release (over several sprints) than sprint themselves.
    I my case we only take a few stories into our sprint hence the above does not tell much during the sprint.
    We tend to break down our stories into tasks and those get estimated in ideal days, then burn down that remaining effort required. Using this vertical scale I find the burn down more useful, particularly if you also display No of story not done/Total No of story against the same time axis. the combination give a good indicator of scope increase/decrease and progress.

    PS: Could send you a sketch if this is not clear ;-)

  • Benjamin Peter October 12, 2012, 12:02 am

    Hi Pawel,

    thanks for your post.

    In our team we handle the change of scope the same way, but in the burn down chart. It is also possible to move the x-axis further down as the scope is increased. This way your performance keeps visual and motivating. :-)

    I would say both techniques are good ways.

    regards

    Benjamin Peter

  • Yuval Yeret October 12, 2012, 6:51 am

    Great article. I prefer burnups as well for the same reasons

    AND

    With burnups you are better prepared for the upgrade to cumulative flow diagrams…

  • Peter Gfader October 13, 2012, 2:08 am

    I am a big fan of the burn-up as well!

    I have considered using an “enhanced burndown chart”, which would help showing the increase of scope… but never invested the time to actually do it :-)

    https://www.google.com/search?q=%22enhanced%20burndown%20chart%22

  • Pawel Brodzinski October 13, 2012, 2:28 am

    @Anton – With burn-up you can focus on both as you have two horizontal lines – x axis and scope line. Adding something to the scope clearly shifts planned date, thus you have clear information that it doesn’t come for free.

  • Pawel Brodzinski October 13, 2012, 2:39 am

    @Thierry – Actually I haven’t exactly said what you track on y axis as it depends on context. In a situation similar to yours, where we split features (Minimal Marketable Features) into smaller tasks (we called these simply development tasks) we tracked just a number of development tasks completed. We didn’t have fixed-length iterations but there were as few as three or four features per release so it didn’t make sense to track it. At the same time we had about 5 or 6 development tasks per feature on average so we could track 15-25 separate items within the scope.

    We could also use hour estimates for these development tasks, as we had them for some time, but decided to go with a simpler method.

    In your case you can burn (up) your tasks either simply counting them or using ideal days.

    By the way: if you have a method of scope accounting which makes sense in terms burn-down chart, simply use the same method for burn-up chart. This way you can have additional information as you go from iteration to iteration, which is how you learn about the scope. I expect that at the beginning of timebox you “design” user stories splitting them into tasks and making estimates in ideal days. Once you’re done with it you can change the scope line in burn-up chart showing that now you know another chunk of work to be done.

    Then eventually you may think about decoupling planning with timeboxes and doing it on-demand — whenever there’s free capability to build another story. But that’s a longer discussion.

  • Dave Moran October 14, 2012, 6:40 am

    Pawel,

    Great post! My own personal preference is to use a sprint burn-down chart and a release burn-up chart. Anton hit the nail on the head for me, burning down focuses on the work remaining – great for teams managing their work/throughput at a sprint level – while a release burn-up chart shows definitive upward progress towards a longer-term objective (the release).

  • Avienaash Shiralige December 18, 2012, 7:09 pm

    Hello Pawel,

    How about using release burndown bar chart? You could read more about this on Mike Cohn blog. I feel it provides great insight on when release is going to be done by tracking scope changes and current progress. http://www.mountaingoatsoftware.com/scrum/alt-releaseburndown

    What are your thoughts?

    Thanks,

    Avie

  • Pawel Brodzinski December 19, 2012, 10:53 am

    @Avienaash – Alternative burndown chart does the job so I’d say it’s definitely better than standard burndown. In terms of my personal approach I prefer burnup at it appeals to me more.

    As Yuval points in one of earlier comments burnup is a nice starting point to Cumulative Flow Diagram which gives you more information than simply burndown/burnup. Anyway given only the basic goals either design should work well.

  • Laurence March 4, 2013, 2:02 pm

    The two are functionally equivalent; you can raise the ceiling or lower the floor on a scope change; Mike Cohn’s blog illustrates this well.

  • ANdreaT October 30, 2013, 1:46 am

    Hey Pawel,
    There are some good insights here, even though I believe your view is a bit biased :-) my take is simple:
    1) when your need is to track the completion of a defined fixed scope, within a defined fixed time, the Burndown chart is the tool which has been designed for that. This is what a Scrum team might use to track progress in a Sprint, where they have a defined scope (what they pulled at the planning meeting) and a fixed time;
    2) when your need is to track progressive trends and make forecast about future release content or delivery date, then the Burnup charts are better suited. I do not have an upper limit set and starting from 0 (zero) you start adding up stories (or value, or whatever else) and monitor trends. On the long terms is very useful for product owners to have constructive and transparent conversations with stakeholders, about what might be released by when, or when a certain scope might be completed.

    My point is simple, like practices, also tools have a meaning depending on the context, and I think saying one is better than the other, without providing alternative contexts is somehow unfair :-)

  • Hendrik Jan van Randen February 18, 2014, 3:00 am

    Great idea, well explained. Thank you!

  • Floris Dafel May 23, 2016, 3:01 pm

    Pawel, great info. thanks!
    You touched on something that I have been tryong to figure out, could you please point me in the right direction.
    – I wondered how can you can quantify scope if all User Stories are not estimated and also not broken down into tasks at the start of a project (usually we to do this for one or two Sprints at a time to get going soonest).
    – You mentioned you can work what “what you have” but could you please give me some ideas of what you use ? Do you estimate / break down tasks for all Stories at the start of a project?

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