Yeah there is a significant lack of resources for ITA and SD. Every textbook I have come across has been poor and some of the definitions are ambiguous.
They really need to change the study design. To get good grades in SACs you need to know HTML/CSS/PHP/etc. and none of this appears on the exam. As a result students stress over little javascript login scripts instead of the core theory.
Questions like the one above only highlight how bad the current SS is. It's also why nearly all of the prac exams are rubbish. No one knows what to expect from VCAA, and if you take a look at some of the recent VCAA papers, even they have no idea (refer to the SD storage question last year, and the physical security MC one from a couple of years back in ITA).
They should just offer an Information Systems subject and a general programming subject. IS will be like ITA in the sense that you use access, dreamweaver, excel, etc. to design and develop your IS + include all of the "general" IT stuff that's currently in the SD course. Remove all of the "business IT" crap that's so dry. Stuff like online communities, why the internet helps businesses, etc. should belong to units 1 and 2.
The programming unit should have an emphasis on algorithms, network infrastructure and advanced modelling (UML use case, concept/data flow diagrams, etc.).