There's also a useful review at TechCrunch.
I've had a look at several examples of Oppia dialogues and, to be honest, they are still pretty primitive. However, I like the idea.
One reason why I'm so positive is because I'm so old I've seen this all before back in the 1980s. Early authoring tools, such as Plato, Tencore and Microtext, used to specialise in 'answer judging' - parsing students' textual input so that the system could make intelligent responses. It was possible to create convincing, engaging and often highly amusing conversations between the system (actually the teacher who authored the course) and the student.
Modern tools all work on the assumption that students will respond to questions by clicking on an option, which makes the tools easier to develop and the courses easier to design. However, multi-choice questions are a blunt instrument when it comes to interacting with a student and certainly don't give the feel of a tutorial relationship.
I hope developers get behind Oppia and build it into a sophisticated tool for creating learning conversations that can then be embedded just about anywhere like YouTube videos. We then need some great examples to inspire writers and designers to leave behind the multi-choice question and start to really relate to their students.
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