Specifying Preferences and Scoring Methods for an RFx Question 
A preference represents your first choice for an answer to a question. Preferences and scoring methods enable you to score questions so that you can compare suppliers on a side-by-side basis. There are two ways to score questions:
Specify a preference and scoring method
Select Manually Scored as the scoring method when you do not specify a preference
After specifying preferences and scoring methods, you set weights for questions. Weights let you establish relative values for different questions and generate scores for each supplier.
To specify preferences:
On the Preferences page, specify your preference for a question, whether and how to score the question, and whether suppliers must meet your preference.
If applicable, enter additional costs as follows:
To specify a single set of associated costs, regardless of quantity, enter the costs in the Associated Costs field. This field only appears if you checked Contributes to Total Cost in the Question dialog box for this question. For details, see Field help for Question dialog box in RFx.
For quantity-based questions, to specify associated costs based on quantity, enter a minimum and a maximum value in the Low and High fields. These values must be within the minimum and maximum parameters you set in the Question dialog box for this question. For example, you might specify a low value of 1 and a high value of 100.
Click the Cost Options button to specify quantity break points. In the dialog box, enter the number of break points and click OK. To continue the above example, you might enter a value of 2 for two quantity ranges, 1-50 units and 51-100 units.
In the Associated Costs fields, enter the associated costs for each indicated quantity range.
Repeat steps 1 and 2 for each question in a section.
Click the Save button in the toolbar.
To go to another section:
Select a section from the sections drop-down list in the toolbar and click Go.