One of the more often used measures of multiple injuries is the injury severity 
score (ISS). Determination of the ISS is based on the abbreviated injury scale 
(AIS). This paper suggests a new algorithm to sort the AISs for each case and 
calculate ISS. The program uses unsorted abbreviated injury scale (AIS) levels 
for each case and rearranges them in descending order. The first three sorted 
AISs representing the three most severe injuries of a person are then used to 
calculate injury severity score (ISS). This algorithm should be useful for 
analyses of clusters of injuries especially when more patients have multiple 
injuries.