It is important to think about how to correct an essay and what the students should learn from it. My aim in this paper, is to look into what different researchers have said about feedback on written assignments and carry out a study of the kind of feedback that is actually used in secondary school today – and of what students and teachers think about it. The results show that underlining is the marking technique mostly used in the secondary school where I did my investigation. This technique was also mostly preferred amongst the students. Two teachers were interviewed and both said that they used underlining because experience has shown that this marking technique is the most effective one. Furthermore, the results from the essays differed when analyzing errors corrected with complete underlining, partial underlining, crossing out and giving the right answer. One marking technique got good results when dealing with one kind of error, and worse in others. My conclusion is that teachers need to vary their marking technique depending on the specific kind of error. Also, the results from a questionnaire showed that most of the students would like to get feedback on every written assignment. Not many of them said that they were already getting it, although this was what both teachers claimed. To conclude, there are many different ways to deal with marking and feedback. The key-word seems to be variation. As long as teachers vary their ways of dealing with marking and giving feedback, they will eventually find one or two that are most effective. Involving the students in this decision can also be a good idea, if they are interested.