The aim of this thesis has been to get an insight into socially marginalized citizens’ experience with ‘Feedback Informed Treatment’ (FIT), which is under evaluation to be a part of ‘Støttekontaktpersonordningen’. FIT is an approach for evaluating and improving the quality and effectiveness of behavioral health services. It involves routinely and formally soliciting feedback from citizens, regarding the therapeutic alliance and outcome of citizen progress. Due to our existing knowledge about socially marginalized citizens, we found it interesting to study whether this formalized and technical approach is compatible with social work in practice, when these particular citizens are the recipients. To examine this we have chosen a qualitative methodology; observation and interview, as this ensures and facilitates a citizen perspective. On the basis of the empirical material, we have discovered that the practitioners (Støttekontaktpersonerne) to a great extent tailoring FIT towards the specific needs of the individual citizens. We have found that tailoring FIT is a prerequisite for the tool to make sense in the context of marginalized citizens. Our conclusion has a high relevance for social work, due to the fact that FIT is expected to be implemented as an intrinsic part of ‘Støttekontaktpersonordningen’.