The measurement of illness severity and mortality risk is essential for making fair comparisons of outcomes among hospitals and routinely available markers of risk such as birth weight, gestational age, and sex do not adequately capture the dimensions illness severity. Scoring system are means to quantify clinical states that are difficult to summarize by other subjective or objective means. The desirable properties of neonatal scores are not much different from those required for scores used in pediatric population. These properties have been described as including: *ease of use *applicability early in the course of hospitalization * ability to predict mortality, specific morbidities * usefulness for all groups of neonates to be described .So SNAPPE-Π developed as a simple neonatal illness severity and mortality risk scores