Alessandro Sicora, author of the chapter, argues that even for the social workers the shift from ‘I/you made a mistake’ to ‘I am/You are a mistake’, that is ‘I am/you are a failure as a practitioner or even as a person’ is easy and common, and shame may be the resulting feeling. Even if criticism may be feedback useful for giving constructive opportunities to learn from mistakes, is more often felt by people as an attack on, and a sabotage of, their own self-confidence, and this more commonly produces shame and, consequently in many cases, a defensive reaction, rather than listening and reflecting. In these circumstances, learning from mistakes becomes almost impossible. This chapter also presents some examples of short reflective writing by social workers and social work students who made an in-depth structured reflection on some of their most relevant experiences in relation to this issue.