Psychological assessment is a fundamental yet often neglected step in mental health diagnosis, in humanitarian interventions. Aid groups mostly provide psychological assistance based on available resources in crisis environments; typically depending on lay counselors or community animators without professional knowledge in mental health evaluation and without access to diagnostic assessment tools. Many survivors, therefore, get general psychosocial support without a knowledge of their particular psychological need. Especially for refugees and internally displaced individuals (IDPs), this chapter emphasizes the crucial significance psychological evaluation plays in humanitarian settings. It makes the case that including psychological assessments into rapid assessment will help to increase the accuracy of mental health interventions, thereby guaranteeing that assistance is customized to fit individual requirements rather than a generic one. Beyond translation, the chapter stresses the need of culturally appropriate psychological tests including local idioms of distress and holistic understandings of mental illness and resilience. By use of a culturally sensitive methodology, psychological examinations are guaranteed to represent the lived experiences of displaced people, therefore enabling more successful interventions. The chapter also addresses the ethical and pragmatic difficulties of using psychological tests in humanitarian environments, along with budget constraints and the need of culturally suitable training for aid workers. By addressing these issues, this chapter lays the groundwork for subsequent discussions on low-threshold interventions and therapeutic techniques for vulnerable East African refugees in humanitarian settings. To improve the general quality and efficacy of mental health treatments, it supports integrating systematic, culturally informed psychological evaluations into crisis response strategies.