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The two category tables on the left side of the graphic allow the user to create a category and then to associate quizzes with that category. This feature is virtually unused (the majority of the records were created by IET personnel as test data.) This feature does not need to be ported to sakai.
The quiz sections relationship is the key to associating questions with a quiz. The process flow is that the user first create a quiz (record) and in the next step makes additional decisions which populate the section record. There is a minimum of a one-to-one relationship when a quiz is created, i.e., for every quiz created (past the initial stage) there is at least one section automatically associated with it. Some quizzes, based on the user's design, will have more than one section.