Abstract. Solving tasks is a very common e-learning activity, and students usually have it in any kind of on-line courses. Tasks in different courses vary a lot in the way they interact with students, for example, they have different user interfaces with different input controls, sometimes they provide hints and instant feedback, sometimes tasks are not more than just pieces of text with pictures or formulas. Tasks usually need a lot of time to prepare, but it almost always impossible to extract a task from a e-learning system (LMS, for example) that contains it, and transfer to another e-learning system. So, if a teacher uses different types of tasks supported by different e-learning system, s/he has to use all of them simultaneously.

There are a number of approaches to deal with this issue, for example, standards IMS QTI, LTI, Scorm deal with packaging of tasks or other learning objects in portable and interoperable way.

The report discusses very different types of tasks from different courses and competitions, interoperability use cases, discusses shortcomings of existing standards based on these use cases and proposes another way to store educational tasks as stand-alone files that may solve arising issues.