Expression Manager to be updated

  Under construction - the following wiki section is a draft.

Quick start tutorial

Within LimeSurvey, you can further customize your surveys via the usage of the Expression Manager (EM). It can be used to specify the following:

1. Navigation/Branching - allowing a respondent's answers to change the order in which the questions are displayed;
2. Tailoring/Piping - how to phrase the question (such as referring to prior answers, or conjugating sentences based upon the age or gender of your subjects), or how to generate custom reports (like assessment scores or tailored advice);
3. Validation - ensuring that answers pass certain criteria, like min and max values or a certain input pattern.

The EM provides an intuitive way to specifying the logic for each of those features. Nearly anything that you can write as a standard mathematical equation is a valid expression.

EM currently provides access to 70 functions, and can be easily extended to support more. It also lets you access your variables using human-readable variable names (rather than SGQA names).

The upcoming sections show the main places where the EM is used.