Hi,

We are implementing the QTI standard v2.0 in our assement platform TAOTAO and we are asking some questions regarding the positionObjectInteraction
This interaction is wrapped into a positionObjectStage and we don't understand why.
Why is there not only an interactions with some choices like the other one.

An example of the standard:


An example of what we think to be logical:


Is there any particular reason that we don't understand?

Thank you

Hi,

The positionObjectInteraction is intended to allow the candidate to indicate one or more points on an image, using the same indicator image in each case.

In positionObject.xml, the candidate must mark three airports. The base image is a map of the UK (uk.png) and each of the airports is marked with airport.png.

Now you could use this in mathematics (my usual subject :-)) to introduce a student to graph plotting: then you would have something like:

<?xml version="1.0" encoding="UTF-8"?>
<assessmentItem xmlns="http://www.imsglobal.org/xsd/imsqti_v2p1"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.imsglobal.org/xsd/imsqti_v2p1 http://www.imsglobal.org/xsd/imsqti_v2p1.xsd"
identifier="plot_point" title="Plotting points" adaptive="false" timeDependent="false">
<responseDeclaration identifier="RESPONSE" cardinality="single" baseType="point">
<correctResponse>
<!-- point (-3,4) -->
<value>90 55</value>
</correctResponse>
<areaMapping defaultValue="0">
<areaMapEntry shape="circle" coords="90,55,12" mappedValue="2"/>
</areaMapping>
</responseDeclaration>
<outcomeDeclaration identifier="SCORE" cardinality="single" baseType="float"/>
<itemBody>
<p>Plot the point (-3,4) on the graph:</p>
<positionObjectStage>
<object type="image/png" data="images/axes5grid.png" width="427" height="428"/>
<positionObjectInteraction responseIdentifier="RESPONSE" maxChoices="1">
<object type="image/png" data="images/point20.png" width="20" height="20"/>
</positionObjectInteraction>
</positionObjectStage>
</itemBody>
<responseProcessing
template="http://www.imsglobal.org/quest..._response_point"/>
</assessmentItem>

The problem the author faces when designing this question is to find a means of identifying a point on the base image, since an image rendered on screen may be placed differently in different renderers. The positionObjectStage will indeed be positioned by the renderer, but the system has access to the position of points on the image, and can recognise where the indicator image has been placed.

I've modified the example to use the above code - as you see, we are asking for the positions of points on the base image, but we do not indicate the positions of the correct points.

I can send you the images, though they are not very good for this - a bit more work needed there!

Cheers
Sue

-------------------------
Sue Milne

ELand Web Ltd, E-Learning Services
University of Glasgow

Hi,

In fact, I've found out how to send the files, so here you are. This is not a content package, just a bundle with the relevant files in it

Sue




-------------------------
Sue Milne

ELand Web Ltd, E-Learning Services
University of Glasgow