Methods for collecting accurate perception data points related to a given item from a set of respondents by offering an incentive that benefits the respondent or respondents who submit data points that match most closely to a calculated value of the data points collected. Provides methods for collecting perception data points by a market research service provider that offers considerably greater information and convenience to prospective initiators of market research service who desire to have a given item be assessed and offer the chances to win incentives to encourage accurate assessment and participation by respondents. Helps one to understand how others perceive the value of a given item so that one may make an educated judgment on how to price such item. The object of the invention is that the more accurate the perception data given by respondents, the more likely the respondents will win the incentive.