Logical Decisions - Classweb
Logical Decisions - Classweb Logical Decisions - Classweb
Next you will see a tradeoff assessment window like the one shown in Figure 7-12. Figure 7-12. Example tradeoff assessment screen. Here, the graph's axes are the ranges of the members. Each point on the graph represents a possible alternative with a particular level on each of the two members. You should assume that each possible alternative has the nominal level on the members not shown. LDW plots the actual alternatives' levels on the two members as crosses on the graph. LDW labels two particular alternatives on the graph. Alternative A has the most preferred level on the first member and the least preferred level on the second member. Alternative B has the opposite situation -- the most preferred level of the second member and the least preferred level of the first. LDW asks you to decide whether you prefer alternative A or B. You tell LDW which you prefer by clicking one of the buttons at the right of the tradeoff assessment window. If you click the "Equal" button, the two members will be weighted equally. If you click the "A" button, LDW will ask you to improve the B alternative by improving its level on the first member. If you click the "B" button, LDW will ask you improve the A alternative by 7-28 Section 7 -- Using LDW 2: Assessing
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
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Next you will see a tradeoff assessment window like the one<br />
shown in Figure 7-12.<br />
Figure 7-12. Example tradeoff assessment screen.<br />
Here, the graph's axes are the ranges of the members. Each point<br />
on the graph represents a possible alternative with a particular<br />
level on each of the two members.<br />
You should assume that each possible alternative has the nominal<br />
level on the members not shown. LDW plots the actual<br />
alternatives' levels on the two members as crosses on the graph.<br />
LDW labels two particular alternatives on the graph. Alternative<br />
A has the most preferred level on the first member and the least<br />
preferred level on the second member. Alternative B has the<br />
opposite situation -- the most preferred level of the second<br />
member and the least preferred level of the first. LDW asks you<br />
to decide whether you prefer alternative A or B.<br />
You tell LDW which you prefer by clicking one of the buttons at<br />
the right of the tradeoff assessment window. If you click the<br />
"Equal" button, the two members will be weighted equally. If you<br />
click the "A" button, LDW will ask you to improve the B<br />
alternative by improving its level on the first member. If you click<br />
the "B" button, LDW will ask you improve the A alternative by<br />
7-28 Section 7 -- Using LDW 2: Assessing
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