IMS Question and Test Interoperability Conformance Guide
Version 2.1 Public Draft (revision 2) Specification
Copyright © 2006 IMS Global Learning Consortium, Inc.
All Rights Reserved.
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Document Name: IMS Question and Test Interoperability Conformance Guide
||8 June 2006
Caution: this specification is incomplete in its current state. The IMS QTI project group is in the process of evolving this specification based on input from market participants. Suppliers of products and services are encouraged to participate by contacting Mark McKell at email@example.com. This specification will be superseded by an updated release based on the input of the project group participants.
Please note that supplier's claims as to implementation of QTI v2.1 and conformance to it HAVE NOT BEEN VALIDATED by IMS GLC. While such suppliers are likely well-intentioned, IMS GLC member organizations have not yet put in place the testing process to validate these claims. IMS GLC currently grants a conformance mark to the Common Cartridge profile of QTI v1.2.1. The authoritative source of products and services that meet this conformance is contained in the IMS online product directory http://www.imsglobal.org/ProductDirectory/directory.cfm
Thank you for your interest in and support of IMS QTI.
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In order to make meaningful statements about interoperability it is necessary to consider the issue of QTI-conformant data and the associated issue of what a system developer needs to do to ensure that their system conforms.
A system vendor or data publisher makes a conformance statement that can be used by the community to compare the capabilities of their product with others. To facilitate creation of conformance statements contentProfile and bankProfile classes are defined that enable a rigorous approach to describing the extent to which the item information and packaging models are supported. The same classes can of course be used to describe a set of requirements. Used in this way they enable smaller communities to express profiles of this specification. For information and advice about setting up and running such communities, readers are referred to the IMS Application Profile Guidelines Whitepaper [IMS_AP].
This specification defines two profiles that can be used as the basis for determining interoperability needs in the absence of any more specific profiling requirement. These profiles are called QTI-Lite Version 2 (which applies only to content) and QTI-All Version 2 and can be used to interpret statements such as "conforms to all of QTI Version 2".
Communities that define their own profiles are strongly encouraged to ensure that all objects conforming to their profile also conform to the QTI-All Version 2 profile described in this document except with respect to additional media types (see objectType and imageType). Profiles that allow (or even require) objects that do not conform to QTI-All Version 2 should describe themselves as extensions of QTI.
This specification defines several types of data objects that may be exchanged between systems and hence require defined levels of interoperability. For example, a set of item statistics may be described as QTI Version 2 Conformant. This section explains what such conformance statements mean.
Assessment Items must be XML documents that conform to the XML schema for assessmentItem defined by this specification and to the additional content constraints described in the information model.
Item packages must conform to the IMS Content Packaging specification and contain assessment items packaged in accordance with the requirements described in the Integration Guide.
Item statistics must be XML documents that conform to the XML schema for usageData defined by this specification.
Response Processors must be XML documents that conform to the XML schema for responseProcessing defined by this specification and to the additional content constraints described in the information model.
In addition to defining conformance criteria for the data objects that are exchanged between interoperable systems, this specification also describes requirements on the way those systems interpret the information described by those data objects. Systems that describe themselves as conforming to "QTI Version 2" must make reference to an appropriate profile. The requirements on each type of system are described below.
A conformant publishing system is any system that can export conforming assessment items packaged as item packages without requiring the use of the extension elements customInteraction and customOperator.
A publishing system may also publish content in a variety of other formats, including some QTI-based formats that make use of the extension elements, but it must be possible to separate this output or the modes of operation that generate it. For example, a publishing system may contain a flag to turn off the use of QTI extensions when publishing content and skip items from the selected data set that would have required them.
A publishing system should create a contentProfile that describes the range of content it can export. The main purpose of such a profile is to describe the requirements for a system that needs to import the data and does not imply that the publishing system exploits the full range of functionality it describes. For example, a publishing system that exports only single response multi-choice questions as conformant QTI assessment items would still add choiceInteraction as an interactionType to its contentProfile even though this describes multiple-response multi-choice questions too (these two question types being inseparable in the contentProfile).
A conformant authoring system allows item authors to create new items, to edit existing items imported from conforming item packages, and to export items into new or updated item packages.
Authoring systems must set or adjust the toolName and toolVersion appropriately when exporting items (unless no changes have been made). When exporting items, all use of extensions must be consistent with the conventions of the tool referred to by these attributes. The extension mechanisms are:
Authoring systems should ignore information represented by the extension mechanisms when importing an item that was created by an incompatible tool.
Authoring systems should also ensure that data that can be represented by the information model defined by this specification is represented in that way. In other words, authoring systems should not make use of the extension mechanisms to represent information that could have been represented without them.
This requirement is made to ensure that authoring systems meet the reasonable expectations of authors when exporting assessment items. For example, an author who creates a question containing a simple choice represented by hotspots on a background image can reasonably expect the exported data to contain a hotspotChoice and not a customInteraction containing a proprietary applet that implements the same functionality on a limited set of delivery engines.
A system that uses an extension mechanism to represent data that can be represented directly in the information model must not claim conformance for that part of the information model in its conformance profile.
Note that a tool may combine the functions of authoring system and delivery engine, to allow authors to try out their items, but it is not required to do so. Where a tool contains a conformant authoring system and a delivery engine it should ensure that the delivery engine is also conformant to prevent authors being misled.
An authoring system should create a contentProfile to describe the range of QTI content that it supports.
An item bank system is a tool for managing collections of items, their meta-data, and any associated usage data.
A conformant item bank system allows item bank managers to import and export collections of items from item packages. Item bank systems must not alter the items' assessmentItem data. Though a given tool may combine the features of an item bank system with an authoring system, to be a conformant item bank system it must still be capable of importing, managing, and exporting collections of items without modification of the associated assessmentItem data.
An item bank system should create a bankProfile to describe the range of features that it supports. Version 1 of this specification described an information model for objectbanks, assessments, and results which have not been updated by this version but may be updated by future versions. Therefore, the conformance of item bank systems with respect to the interoperability of item banks, assessments, and results and the associated bankProfile class is subject to change.
A delivery engine is the component of a system that allows the user or candidate to interact with an item, to assign values to response variables and to invoke response processing and provide feedback as appropriate. A delivery engine may be part of a full-blown assessment system or it may simply be a component of an authoring or editing system.
A conformant delivery engine conforms to the requirements described in the information model with respect to its behavior in delivering the items. For example, it must provide suitable controls that operate in accordance with the requirements of each supported interaction and maintain the data described by the item session.
This class provides a framework for describing the capabilities or requirements of an authoring system or delivery engine. Most of the elements of the profile are booleans that indicate whether or not a specific feature is supported (true) or not supported (false). When being used in the context of expressing requirements the values correspond to required or optional respectively. This profile class does not support exclusion of features.
Whether or not the system has core support for the printedVariable element. Note that support for the r conversion type specifier is controlled separately rounding.
The supported interaction type(s). The vocabulary is comprised of the names, as defined in the information model, of the leaf classes derived from interaction with the exception of customInteraction. See below for interaction-specific conformance notes.
Whether or not the system supports response rules in response processing. Systems that set this to true are assumed to be able to process arbitrary templates so need not list these individually. Note that support for the equalRounded and patternMatch operators is optional, see rounding and regexp respectively.
Whether or not the system supports regular expression matching: if the textEntryInteraction or extendedTextInteraction then the patternMask attribute is also supported; if responseRules is supported then the patternMatch operator is also supported.
Most of the simple interactions can be supported in isolation. For example, it is possible to define a meaningful profile with the a single value of choiceInteraction for interactionType and no other conforming features.
Some interaction types require the use of XHTML-based elements that are subject to their own flag in the profile. A profile that contains an interactionType indicating support for one of these types must also set the flags for any required XHTML-based element to be valid. These requirements are listed below.
|gapMatchInteraction||Requires textElements. If a system supports gapMatchInteraction and objectElements then it must support use of gapImg with any image objectTypes in the profile. A system that supports gapMatchInteraction but no image objectTypes does not support gapImg.|
|inlineChoiceInteraction, textEntryInteraction, hotTextInteraction, endAttemptInteraction||Require textElements.|
|hotspotInteraction, selectPointInteraction, graphicOrderInteraction, graphicAssociateInteraction, graphicGapMatchInteraction, positionObjectInteraction, drawingInteraction||Require objectElements and at least one suitable objectType.|
This class provides a framework for describing the capabilities or requirements of an item bank system. It has a similar dual use for specifying capabilities and requirements as the contentProfile class.
Note that item bank systems must be able to import and export items from content packages and must be able to operate in a mode whereby all imported usage data and meta-data from a vocabulary or scheme to which conformance is claimed can be exported again with the same set of items.
usageDataVocabulary uri [*]
The URI of a vocabulary file (or files) describing the vocabulary of supported usage data. Reference to a vocabulary indicates that a system supports usage-data files packaged according to the method described in Integration Guide.
QTI-Lite is presented as the entry-level profile to the full QTI specification and only concerns content, its creation, modification, and delivery. In other words, it does not concern item bank systems. QTI-Lite does not support all of the features of the full specification but it is a proper profile, in other words an assessment item that conforms to the QTI-Lite profile also conforms to the default "QTI-All" profile defined below.
The key differences between the QTI-Lite and the QTI-All profile are:
Note that the inclusion of multiple-response questions represents an expansion of the scope of QTI-Lite since version 1 of this specification but that the restrictions on response processing, in particular the lack of support for the Map Response template, should not present a significant burden to implementors.
The content profile that describes conformance to the full QTI Version 2 specification includes a complete list of features and a minimal set of media types.
Content Profile Definition
Bank Profile Definition
||IMS Question and Test Interoperability Conformance Guide
||Steve Lay (Cambridge Assessment), Pierre Gorissen (SURF)
||Public Draft v2.1 (revision 2)
||8 June 2006
||Public Draft (revision 2) Specification
||This document describes the QTI Conformance Guide specification.
||8 June 2006
||This document has been approved by the IMS Technical
Board and is made available for public review and comment.
|To register any comments or questions about this
specification please visit:
The following individuals contributed to the development of this document:
||University of Surrey
|Version No.||Release Date||Comments|
|Base Document 2.1
||14 October 2005
||The first version of the QTI v2.1 specification.
|Public Draft 2.1
||9 January 2006
||The Public Draft v2.1 of the QTI specification.
|Public Draft 2.1 (revision 2)
||8 June 2006
||The Public Draft v2.1 (revision 2) of the QTI
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Please refer to Document Name: IMS Question and Test Interoperability Conformance Guide Revision: 8 June 2006