all of the questions or items in the list. The same principle applies to the order of response options in a single question. For many questions, we randomize the order in which the answer choices are presented. That way, any affect that the order of the answer choices has on responses is spread randomly across the options. How is form 1 different from form 2? We often write two versions of a question and ask half of the survey sample one version of the question and the other half the second version. Thus, we say we have two forms of the questionnaire. Respondents are assigned randomly to receive either form 1 or form 2 so we can assume that the two groups of respondents are essentially identical. On questions where two versions are used, significant differences in the answers between form 1 and form 2 tell us that the difference is a result of the way we worded the two versions. For example, in January 2003, we asked this question on form 1: "Would you favor or oppose taking military action in Iraq to end Saddam Hussein's rule?" On form 2, we asked: "Would you favor or oppose taking military action in Iraq to end Saddam Hussein's rule even if it meant that U.S. forces might suffer thousands of casualties? " In this experiment, the form 1 question found 68% favored removing Hussein from power. But the mention of thousands of U.S. casualties in form 2 led to far fewer