A customer requested to have Pareto charts being provided as part of JIRA Service Desk. Here is what she said:

"To manage solving the problem long term, we want to prioritize the items we go after: biggest bang for the buck. We use Pareto charts to see where the most issues occur, so that if we solve that problem (software change, training, redundancy, etc.), then we get the biggest return on future call prevention.

As we discussed at the conference, it would be great to have JIRA Service Desk support Pareto charts.
If a gadget were a Pareto chart, I would think that it would follow current gadget setup including: Pick the filter you want to use and pick the field to use across the bottom of the chart (example: System, location, root cause… etc.)

The black line is just the cumulative percent up to 100%, where Pareto 80-20 rule: which items together solve 80% of the problems. Chart is sorted left to right by number% of tickets. "

Check the attachment for a visual representation

Check the following links for more details:
http://wiki.servicenow.com/index.php?title=Pareto_Charts
http://en.wikipedia.org/wiki/Pareto_chart
http://asq.org/learn-about-quality/cause-analysis-tools/overview/pareto.html