Max-Diff is an alternative to rating scales and seeks to solve the same problem that is solved by Ratings With Rankings To Split Ties.
A max-diff experiment presents respondents with a series of questions like the one shown below where the set of alternatives shown is varied from question-to-question so that it is possible to isolate the relative appeal of the different alternatives.
What is the MOST and LEAST important factor to you when you choose a car? MOST LEAST Price Top speed Fuel economy Emissions Paint color
It is sometimes described as a Choice Modeling method, as similar tools are used to create the experimental designs and to analyze the data.