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The Opaque question type and behaviour Opaque (http://docs.moodle.org/en/Development:Opaque) is the Open protocol for accessing question engines. The Opaque protocol was originally created by sam marshall of the Open University (http://www.open.ac.uk/) as part of the OpenMark project (http://java.net/projects/openmark/). The Moodle implementation of Opaque was done by Tim Hunt. As well as OpenMark, this question type can also be used to connect to ounit (http://code.google.com/p/ounit/) and possibly other question systems we don't know about. Opaque has been available since Moodle 1.8, but this version is compatible with Moodle 2.6+. This question behaviour also requires the Opaque question type to be installed. To install using git, type this command in the root of your Moodle install git clone -b MOODLE_25_STABLE git://github.com/moodleou/moodle-qtype_opaque.git question/type/opaque echo '/question/type/opaque/' >> .git/info/exclude git clone -b MOODLE_25_STABLE git://github.com/moodleou/moodle-qbehaviour_opaque.git question/behaviour/opaque echo '/question/behaviour/opaque/' >> .git/info/exclude Alternatively, download the zip from https://github.com/moodleou/moodle-qtype_opaque/zipball/master unzip it into the question/type folder, and then rename the new folder to opaque. Then download the zip https://github.com/moodleou/moodle-qbehaviour_opaque/zipball/master unzip it into the question/behaviour folder, and then rename the new folder to opaque. Once installed you need to go to the question type settings page (Site administration -> Plugins -> Question types -> Opaque) to set up the URLs of the question engines you wish to use. https://github.com/moodleou/moodle-local_testopaqueqe can be used to test that Opaque is working. To be able to run the unit tests, you need to add define('QTYPE_OPAQUE_TEST_ENGINE_QE', 'http://example.com/om-qe/services/Om'); define('QTYPE_OPAQUE_TEST_ENGINE_TN', 'http://example.com/openmark/!question'); define('QTYPE_OPAQUE_TEST_ENGINE_PASSKEY', 'abc123'); define('QTYPE_OPAQUE_TEST_ENGINE_TIMEOUT', '5'); to your config.php file. Of these, only the first is required. The remaining ones are optional. Specify them if your set-up needs them.