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Figure 3. This is the best type of function
test. It provide realistic economic "weighting" to decisions
regarding which feature to keep over other features. However, this only
works if the subject actually buys your type of software, is knowledgeable
about the features, has a personal, meaningful budget, and has an economic
limit. (Too much wealth lets the subject pick all features without penalty.)
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Figure 4. Second best. In this form of questionnaire,there
is no natural limit to expenditures. You must impose a hypothetical limit.
Can your subject avoid getting carried away?
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Figure 5. Third best. Sometimes dollars
don't make any sense in your situation. However, this method only indicates
which function is at the top of the list. You don't get any fine tuning
regarding the degree of differences. Using dollar amounts, as in the first
two methods, gives you a sense of the relative weighting or desirability
of the functions.
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Figure 6. Fourth best and really weak. Subjects
can easily select every item as "Extremely Valuable" as a way
out of making tough decisions. Take the results with a grain of salt.
You may not really have a winner! Better used with a small number of subjects
whom you can interview for their reasons.
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