The study was carried out at Kokilaben Dhirubhai Ambani Hospital, Mumbai. This study aims to evaluate the two well-performing prognostic model helps to make meaningful comparisons as which is more apt for the organization along with assessing the quality of care through severity scoring system in Intensive Care unit. This will help hospital in assessing hospital’s current performance with its past such systems also provide objective data on which physicians may ground a spectrum of decisions regarding patient.The objective of this work is to find objective data which can help physician ground a spectrum of decisions regarding either escalation or withdrawal of therapy in critically ill patients. With a decision criteria of 10 %, sensitivity - that is, the proportion of deaths predicted by the model - was better for SAPS II (9%) than for APACHE II (20 %); however, the false-positive rate was high for both (APACHE II 66.32 %, SAPS II 58.68 %); the overall correct classification was better for SAPS II (57.54 %) than for APACHE II (53.56 %). This study demonstrated that both models failed to predict mortality accurately - that is, overall calibration was poor.