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Map the all subsystems (components) of your ITU-MiniTwit in a UML component diagram.
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That is, map all those parts that are either deployable separately or that contain bigger logical groups of functionality.
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If rusty on component diagrams, you may want to check one of the following websites:
- https://developer.ibm.com/articles/the-component-diagram/
- http://www.agilemodeling.com/artifacts/componentDiagram.htm.
- https://en.wikipedia.org/wiki/Component_diagram
Read the first 7 pages of Kitchenham et al. "Software quality: the elusive target" until section "MODELING QUALITY".
If you feel like you can of course read the entire paper.