Association/Composition Question
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Posted By:   varun_chopra
Posted On:   Wednesday, July 25, 2007 05:05 PM

If I have to model an online exam system, where I have 4 entities: Test Subject Question User Each Subject [has a number of] Questions Test [is based on a] Subject Test [contains] Questions Users [appears for] Test Based on above, I was wondering if Test composes Questions and Subject also composes Questions??? Should it be composition of Questions for both Subject and Test? In addition, Test is associated to Subject. But should Subject be an instance variable in Test? Isn't it composition then? regards Varun    More>>

If I have to model an online exam system, where I have 4 entities:

Test

Subject

Question

User



Each Subject [has a number of] Questions

Test [is based on a] Subject

Test [contains] Questions

Users [appears for] Test



Based on above, I was wondering if Test composes Questions and Subject also composes Questions??? Should it be composition of Questions for both Subject and Test?



In addition, Test is associated to Subject. But should Subject be an instance variable in Test? Isn't it composition then?



regards
Varun

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