Considering the above mentioned event distribution and the probability values, it is ensured that a specific node of its lifetime r units (rounds or seconds), ⌊66.6×r⌉ times it would sense ordinary event, ⌊22.2×r⌉ times it would sense critical event and ⌊11.1×r⌉ times it would be very critical event. This probability also ensures that at any time, ⌊66.6×|E|⌉ out of |E| event sensing nodes would be ordinary nodes, ⌊33.3×|E|⌉ nodes would be critical and ⌊11.1×|E|⌉ nodes would sense very critical event. However in this model nodes are selected randomly as critical, very critical and normal but it is ensured that the length of each set of node is not changed.