Logical Decisions - Classweb

tradeoffs based on the AHP weights that will be available for your
review.
Defining Interactions
You can define interactions between the active members with the
options under the “Interactions” tab of the assess weights dialog
box. These options parallel the options for assessing weights
under the “Weights” tab. Since interactions are an advanced
LDW feature, you should generally use the default of no
interactions. When you select no interactions, the weights will
sum to one and LDW will compute the utility for the active goal
as a simple weighted average of the utilities for the active
members. You don't need to do any interaction assessments if
you use this default option. See the discussion on page 9-55 for
more information on interactions.
You select the method for assessing interactions for the active goal
from the list labeled "Interactions Assessment Method:". The
following methods are available:
! "No Interactions" -- forces the MUF formula to be
additive (this is the default).
! "Second Tradeoff " -- defines the interactions by entering
a second tradeoff for two of the active members.
! "Probability Method" -- defines the interactions by
identifying two equally preferred alternatives that
involve uncertainties.
! "Set a Small k" -- directly enter the scaling constant for
an active member. (This along with the weights
or tradeoffs will completely define the MUF
formula.)
! "Product of Utilities" -- computes a goal’s utility as the
product of the utilities of its members
Each of these methods is discussed in detail in the following
sections.
You begin the interactions assessment process for the selected
method by clicking the "Assess" button. What happens next
depends on the assessment method you have selected. You can
delete any interactions information you have assessed by
Section 7 -- Using LDW 2: Assessing 7-41