Aim: The purpose of this study is to describe the intervention process at a psychiatric clinic in Vietnam, from evaluation to goal setting, and how the staff choose occupation-based intervention for their patients. Method: This study is a qualitative study with inductive approach where the data collection is based on a semi-structured interview with the health care staff at a psychiatric clinic in Vietnam. The respondents consisted of a total of ten participants and were required by a purposive sample. Content analysis according to Kristensson (2014) was used to examine the data. Result: The findings from the result revealed that the clinic work without a standard procedure where the staff evaluates and assess their patient from their own experience. They also interview and observe the patients without an aim. The result also showed that the clinic offers different occupation-based interventions where the doctor decides occupation-training but not in consultation with the patient. It was revealed that the purpose of the occupation is to make the patients independent. The last finding was that the staff has a lack of individual goal setting and the general goal is for patients to get healthy. To see if the patients achieve improvement, observations are made without aim. Conclusion: The study concludes that the health care staff at the clinic has found their strategies using their own experience, for evaluating and assessing their patients.