There are quite a few situations in which a test administrator would like to deliver tests in a much more controlled format. Along with many different ways to accomplish this, two most prominent features are

• All questions are mandatory and therefore non skip-able
• Allow only forward navigation and thereby preventing returning to a previous question

These restrictions are more useful in adaptive style of testing or testing a user's knowledge about critical concepts thereby limiting the ability of the user to skip any question. Either one or both of these conditions can be enforced in Gilly by the test administrator. These features can be enabled by the test author in the test authoring site. While creating (or editing) the test, go to the UI Options tab. The properties "All Questions Mandatory" and "Allow Only Forward Navigation" control these behaviors.