Adding a Question to the Expression Parser

Before you can use a question's response value in an expression, you must first add that question to the Expression Parser.

Group items that do not hold a response value - Buttons, for example - do not need to be added to the expression parser.

Implementation:

  1. Switch to the Definition tab.
  2. Select the intended question.
  3. Switch to the Properties tab.
  4. Select the Further Question Options radio button.
  5. Tick the Add To Expression Parser check box.
  6. Click Save Question.

With this option enabled, the question's value can be used in an expression by referencing the question's Keyword. This is one of the reasons why question keywords must be unique, and why identifiers cannot have the same keyword as a question.