The International Classification of Functioning, Disability and Health (ICF) is intended to provide a framework for practitioners. A client-centred ICF-based assessment (ICF-A) was developed to be used by occupational therapists in problem identification. The aim was to evaluate the ICF-based assessment (ICF-A) focusing on the examination of its utility on the basis of occupational therapists´ perspectives regarding clinical relevance and potential for implementation. Eleven occupational therapists, most of whom worked in hospitals, performed in total 99 ICF-A based assessments and completed three self-reported questionnaires related to the utility of the ICF-A, resulting in a total of 121 questionnaires.Data were analysed using descriptive statistics and directed content analysis. The results from this initial testing of ICF-A showed that its clinical relevance was considered low since ICF-A included too many categories. In addition, the time needed to perform the assessments decreased during the ten assessment occasions. Furthermore, concerning its implementation potential, the client-centred approach in the ICF-A was rated as weak. The target group did not benefit from using ICF-A in a hospital context. Hence, an investigation of its utility among occupational therapists in community and primary care will be the next step in the development of the ICF-A.