The primary research objective is to investigate the relationship between the education, satisfaction and staffing level of the nurses and the mortality rate across HMC. The relationship between mortality will be investigated against some additional demographic characteristics of the patient and the nurses as well as a umber of clinical parameters like the length of stay and the severity of the interventions. To achieve that data will be retrospectively collected from the Human Resources database containing the nurse education and demographic information and will combine it to the intervention data coming from the clinical information systems of all major public hospitals in Qatar excluding accident and emergency cases to avoid confounding. Rigorous statistical analysis will be conducted to obtain the significance of this relationship within expected confidence intervals. The end result of that process is to find whether there is a significant positive or negative relationship between nurse education and mortality rate.