QTI
Specification for assessment contents and results representation / From Wikipedia, the free encyclopedia
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The IMS Question and Test Interoperability specification (QTI) defines a standard format for the representation of assessment content and results, supporting the exchange of this material between authoring and delivery systems, repositories and other learning management systems. It allows assessment materials to be authored and delivered on multiple systems interchangeably. It is, therefore, designed to facilitate interoperability between systems.[1]
The specification consists of a data model that defines the structure of questions, assessments and results from questions and assessments together with an XML data binding that essentially defines a language for interchanging questions and other assessment material. The XML binding is used for exchanging questions between different authoring tools and by publishers. The assessment and results parts of the specification are less widely used.
As can be seen below, the standard is mainly implemented by commercial products, few open source assessment systems support it and the most popular open source learning management systems (Moodle does not support it and Canvas only supports the old 1.2 version) limit support. The fact that you have to register to download the specs begs the openness of the standard.