[QTI] QTI multiple response question with empty answer

[Jonathon Hare]

Hi Bart,

Of course QTI can do this :-)

Your 3rd example is almost correct (no need to specify  
<correctResponse>) - you just need to change the scoring criteria.  
Perhaps something that checks the number of responses is 0? Try  
replacing the <match>...</match> clause in <responseProcessing> with  
something like (untested):

<equal>
	<containerSize>
		<variable identifier="RESPONSE"/>
	</containerSize>
	<baseValue baseType="integer">0</baseValue>
</equal>


Jon


On 25 Nov 2009, at 15:32, Bart Nagel wrote:

> Hi, folks.
>
> How can I have a multiple response question where the correct answer
> is to not tick any of the boxes?
>
> I have some example QTI files on the web:
> http://users.ecs.soton.ac.uk/bjn/multipleresponse1.xml
> http://users.ecs.soton.ac.uk/bjn/multipleresponse2.xml
> http://users.ecs.soton.ac.uk/bjn/multipleresponse3.xml
>
> multipleresponse1.xml is a question where the correct response is to
> tick the first box. That's fine.
>
> multipleresponse2.xml was how I expected to show that the correct
> response is to tick no boxes -- an empty correctResponse tag. It
> doesn't validate (using JQTI):
> Error: Not enough children: value. Expected at least: 1, but found: 0
> (assessmentItem:mcr_598->responseDeclaration:RESPONSE- 
> >correctResponse)
>
> multipleresponse3.xml was another attempt -- the responseDeclaration
> tag is empty. This validates but when I load it into QTIEngine
> (http://qtiengine.qtitools.org) it doesn't accept no ticked boxes as a
> correct answer.
>
> I wonder if someone can point me in the right direction?
>
> Thanks
> --bart nagel
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> IMS-QTI at lists.ucles.org.uk
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