Translations:Expression Manager/9/en

Some surveys use "Goto Logic", such that if you answer Question 1 with option C, then jump to Question 5. This approach is very limiting, since is hard to validate, and easily breaks when you have to re-order questions.  EM uses a Boolean relevance equation to specify all of the conditions under which a question might be valid.  If the question is relevant, then the question is shown, otherwise it is Not Applicable, and the value NULL is stored in the database.  This is similar to what can be done via the Conditions editor, but EM lets you easily specify much more complex and powerful criteria (and lets you use the variable name rather than SGQA naming).