Bubble Charts and Normalization


Bubble charts are common place in portfolio management processes. Without a designated portfolio management tool, I have designed bubble charts by hand using Excel and PowerPoint. To determine a ‘value’, we use our prioritization value scores and compare that among projects. We have risk scores as part of our prioritization criteria that drive the ‘risk’ portion of our bubble charts. The challenge in the past was how to interpret a score. Is a score of 500 good or bad?  Since my organization was experimenting with a new prioritization process, we didn’t know what was good or bad. Therefore, I made the decision to normalize the scores so that we could fairly compare good or bad projects within the portfolio rather than try to determine a threshold for ‘good’ projects. This has been helpful in identifying which projects drive more overall value to the organization compared to other current projects in the portfolio. The downside of this however, is that you are always going to have a few projects that look bad. Until now, I had been normalizing only among current projects in the portfolio, yet it suddenly dawned on me this morning, that I should also normalize among all projects, past and current in order to understand whether we get more value now than in the past.

One advantage of a bubble chart is to locate those projects that are higher value and lower risk and ask the question, “how can we get more of these types of projects in the portfolio?” Likewise with the lower value higher risk projects, we should ask how to avoid those types of projects. By normalizing with respect to past and current projects, we will see whether or not the projects are moving toward the higher value lower risk quadrant.

Tim Washington
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Tim Washington

Senior Associate at Point B
I am an Associate at Point B consulting with a professional goal of making companies successful with project portfolio management.

My personal approach is to right-size portfolio management processes to fit an organization's culture and maturity to be effective without creating a bureaucracy. Please contact me if you would like to know more about how project portfolio management (PPM) can help your organization achieve its strategic goals.
Tim Washington
Follow me

Tim Washington

I am an Associate at Point B consulting with a professional goal of making companies successful with project portfolio management. My personal approach is to right-size portfolio management processes to fit an organization's culture and maturity to be effective without creating a bureaucracy. Please contact me if you would like to know more about how project portfolio management (PPM) can help your organization achieve its strategic goals.

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