Deltek Acumen 8.8 Online Help

Using the Help Search
Using the Help Search
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For more information:Searching Online Help

Risk Distribution (Including 3-Point Risk Impacts)

As a risk user, you may want to set the minimum, maximum, and most likely impacts to time and cost.

You can select a shape (Triangle, Normal, Uniform, and BetaPert) in the following areas:

  • S3 Activities grid
  • Risk Register
  • Risk Events tab
  • Duration Uncertainty tab
  • Cost Uncertainty tab

Acumen calculates default values for the most likely duration and cost but you can edit them to skew the impact curve.

Triangle

When you select the Triangle, Acumen calculates the minimum, most likely, and maximum impacts to time and cost. This is the default type.

Normal

This type calculates a mean remaining duration. The normal curve includes a standard deviation option that controls the width of the bell curve. The default is 1.

Uniform

This type calculates a minimum and maximum remaining duration.

BetaPert

BetaPert is similar to a Normal distribution but it allows for positive or negative bias. While a Normal distribution is symmetrical on either side of the Most Likely value, with a BetPert distribution, the Most Likely value can be closer to the optimistic or pessimistic value. This type of distribution works best with activities that have reliable performance data.

When you select the BetaPert shape, Acumen enables the Most Likely Duration and Most Likely Cost columns on the Mappings tab.

TriGen

The TriGen distribution is similar to the Triangle but it allows you to also specify "nearly" or probable values. This distribution type helps to correct under reporting of extreme ranges because you build in a percentage probability that the distribution limits can be exceeded.

When you use TriGen, you specify Minimum, Most Likely, and Maximum values as well as Lower and Upper Percentage.

For example, if you specify 10 and 90 as the Lower and Upper Percentages, your Minimum is really the 10th percentile with the absolute minimum slightly below it and your Maximum is really the 90th percentile with the absolute maximum slightly above it.