Logical Decisions - Classweb

improving its level on the second member. If you would like to
revise the question, click the "Revise" button. You can then
modify the graph with the options in the Tradeoff menu.
If you click the "A", "B" or "Revise" button, you will begin the next
part of the tradeoff assessment. Suppose A was less preferred.
LDW will ask you to improve A until you prefer it equally to B.
You do this by changing its level on the member where it had the
lower utility -- "Price" in the example. There should be a point on
the range of "Price" where you would prefer A and B equally.
LDW highlights the line where you should improve A in green.
You can use your mouse to change A’s level on price by dragging
it along the line. LDW reflects your changes in the edit box at the
bottom of the window. You can also enter a new level for "Price"
directly in this edit box. When you confirm the new level by
pressing Enter, LDW moves A to the correct location on the
graph.
When you have found a level for A that makes it equally
preferred to B, click the "Equal" button to let LDW know.
LDW will ask you to confirm that the tradeoff is OK. Before
confirming, LDW redraws the tradeoff using the original ranges
of the members. It connects the A and B alternatives with a line of
equally preferred alternatives based on the SUFs for the
measures. You should feel that you prefer any point along that
line equally to A and B.
If you select "OK", LDW will save the tradeoff and return to the
tradeoff assessment dialog box. If you select "Delete" or "Cancel",
LDW will discard the tradeoff before returning to the dialog box.
If you select "Redo", LDW will return to the initial tradeoff
assessment question.
Options for revising the tradeoff. The Tradeoff menu provides
two methods for adjusting the ranges for the members in the
tradeoff.
The Tradeoff::Revise Range option lets you directly enter revised
ranges for the two members in the tradeoff. These new ranges
will define the axes in the tradeoff graph but will not affect the
ranges for the members elsewhere. When you select this option,
LDW will let you enter the new ranges in a dialog box. LDW
redraws the tradeoff question to reflect the new range and restarts
the tradeoff assessment process.
Section 7 -- Using LDW 2: Assessing 7-29