In the language of a teacher, Stage 0 is about diagnostics. The idea is very simple: test what you are going to teach.

Starting with a series of diagnostic tasks helps one understand the need for further learning. In other words, the learner must face a problem. Definition and acceptance of the problem is the main outcome of this stage. 

By the end of working at Stage 0, the learner is able to do the following:

• formulate what (s)he would like to achieve (desired result)
• give examples of own mistakes (obstacles)
• explain how the mistakes prevent from achieving the result
• define learning objectives for further work