Students can be undecided or if they haven’t received enough feedback from the teacher, they may have doubts regarding to the progress that they have made; therefore they can provide wrong answers, making the self-assessment process invalid. Students need to have a very high degree of consciousness, so they can be able to analyze the errors that they have made, but most importantly, their performance during the course or unit.
Self-assessment can be very time consuming, so as teachers we have to plan it beforehand and write an adequate format, so it doesn’t take students too long to answer it, and so it is easy to check.