 The balanced-research instructions directed participants to create a "balanced" argument, i.e., that included both pros and cons; the unrestricted-research instructions included nothing on how to create the argument.Overall, the results revealed that the balanced-research instructions significantly increased the incidence of opposing information in arguments.These data also reveal that personal belief is not a "source" of myside bias; however, that those participants, who believe that a good argument is one that is based on facts, are more likely to exhibit myside bias than other participants.