Article ReviewIn the quantitative study of Turid Moller and Olav Linaker (2010), they examined and compared recordings of information given by psychotic patients regarding their problems with alcohol and drugs. In their study, the research question is: “Do psychotic patients underassess themselves during initial clinical interventions and what are the effects of underassessment on their treatment outcomes?” The null hypothesis is that failure to diagnose and address substance abuse will not result in high rates of relapse and hospital readmissions. Therefore, the alternative hypothesis is that failure to diagnose substance abuse will result in high rates of relapse and hospital readmission. First, the study focused on assessing the “psychometric adequacy” of self-reports and staff reports of alcohol and drug problems among patients with serious mental disorders (Moller and Linaker , 2010). Second, the study aimed to determine whether psychotic patients provided inadequate assessments of their alcohol and drug abuse problems. Methods Data collection was carried out through random sampling of patients from the city of Trondheim. Data were collected from September to October 2001 from a total of 48 participants, 22 and 26 outpatients and inpatients, respectively (Moller and Linaker, 2010). The sample population provided primary data by completing questionnaires: the Short Michigan Alcohol Screening Test (SMAST-13) and the Drug Abuse Screening Test (DAST-20). Similarly, nurses collected secondary data on staff reporting tools, namely the Alcohol Consumption Scale (AUS) and the Drug Consumption Scale (DUS). In the study, the SMAST-13 and DAST-20 tools were used due to their simplicity and accuracy in predicting substance use disorders. Simplicity ensures that participants...... middle of paper ......are committed to using tested and trusted clinical tools that show a high degree of consistency and accuracy. However, the number of participants is small and may not be a true representation of the psychotic patient sample. For example, when comparing 48 people to the millions of people suffering from psychotic disorders, this has no practical significance. Regarding weaknesses, the generalizability of the results is limited because the sample population is not an accurate representation of the entire population. population of psychotic patients (Francis, 2008). For example, people from other cities should have been selected. Therefore, future research should conduct similar studies in different cities around the world so that the results can be compared. A comprehensive comparison with the results of other cities will facilitate the generalization of the results.