Logical Decisions - Classweb

Suppose you have a feeling that there is some interaction between
the members of the Performance goal. Specifically, you want it all
-- both high power and good fuel economy. In other words, if a
truck does poorly on “Power” or “Fuel Economy,” you feel it
should have a low “Performance” utility no matter how well the
truck does on the other measure.
In addition, you prefer a truck that does moderately well on both
measures to a truck that does very well on one measure and
poorly on the other. This is called "destructive interaction."
To quantify this idea you must answer another preference
assessment question:
1. Select the Assess::Weights option.
2. LDW will display the assess weights dialog box.
3. Click the “Interactions” tab.
4. Select the "Performance" goal from the “Goal” combo
box.
The several ways to define interactions are listed in the
“Interactions Assessment Method” combo box. Of these methods,
the most easily understood is the probability method.
5. Select the probability method for defining interactions
from the combo box.
6. Click the "Assess" button to begin the assessment
process.
Normally, LDW would ask you to select an existing tradeoff in the
performance goal to use as a basis for the probability question.
However, in this example, there is only one tradeoff to select (the
one between Power and Fuel Economy). After you select the
tradeoff, LDW displays the screen shown in Figure 5-5.
The alternatives in the question are both made up of two
possibilities, each of which occurs with 50 percent probability. It
may be difficult to visualize a situation where such alternatives
would occur. For our example you might think of the alternatives
as a special deal offered by two truck manufacturers to get you to
5-16 Section 5 -- Advanced Tutorial