Tornado diagram is used for
sensitivity analysis i.e., comparing the relative importance of variables. It’s
a special type of bar chart where the data categories listed vertically instead
of horizontal. The chart visually resembles like a tornado. For each variable
you need to estimate the low, base and high outcomes considering the
uncertainty involved. This helps in understanding the sensitivity/risk with
respect to the associated variables.
Below scenario explains one of
the variants of the tornado diagram, this is been applied in the context of sub
processes combined into a process and each sub process has varying cycle time
and targets. The main ideas for this variant representation is to understand
the sub process wise mean cycle time, variation and the targets in a single
diagram.
Scenario:
One of the Projects that we get
as a part of our service catalog is to configuring new servers for hosting the
applications. The entire process of configuring new servers will take around
1-2 months. To configure the new server there are multiple steps including
creating a request, assigning a project manager, purchasing the hardware if
required, space approvals, capacity review etc.,
Each of these steps needs time
that is varying from project to project depending on multiple reasons. There is
a need to understand the mean, variation and the targets with respect to cycle
time for all the steps of a new server configuration visually in a single
diagram.
Variant of Tornado Diagram:
Data is gathered on all the sub
process/ steps involved in this project. Data gathered includes cycle time
mean, variation and target. 95% of the time the projects have to meet the
targets as per the commitment with customer.
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