PURPOSE: Delirium is characterized by acute onset of fluctuating course of inattention accompanied by a change in cognition or perception. Delirium is one of the common end-organ dysfunction across hospital settings, occurring in up to 80% of critically ill patients that require ICU care. A patient who experiences delirium is more likely to experience increased short- and long-term mortality, increased time on ventilator and risk of re-intubation, increase in ICU and hospital length of stay. Since Delirium requires clinical diagnosis, it can easily be overlooked or missed. Development of reliable delirium-screening tools helps in early recognition of Delirium, allows clinicians to intervene on time and thus decreases morbidity and mortality.