Objective – The aim of the study was to investigate the attitudes in the decision making process for admitting patients compulsorily under the Italian Law 180/78. Setting – A group of psychiatrists (n=81) working in the area of Cagliari (Sardinia, Italy). Main outcome measures – Three case–vignettes describing different hypothetical clinical situations: 1) a man with depression and psychotic symptoms; 2) a woman with a possible first episode of psychosis; and 3) a man with a history of substance abuse and bipolar disorder. Each vignette was followed by a list of 11 factors reported in the literature as important in the decision to admit compulsorily (current mental state, severity of the disease, dangerousness to self or others, psychiatric history, likely response of the mental state to the medical treatment, age and gender of the patient, owning a home, occupational status, social support available). Psychiatrists were asked: a) whether they would admit the patient compulsorily; and b) to rate 11 factors from the most to the least important in their decision.