In order to spare the resources (memory, CPU time), it is necessary to limit the number of individuals (Fib objects) in the working process (individuals wich participate in the genetic algorithm). Therefore (if required) individuals have to be removed from it. In this process individuals with lower fitness are preferred.
There is therefore a mortality rating algorithm for the algorithm. It determines the probability, with which a individual is deleted. To delete individuals, there is a separate loop in the algorithm, in which is tested, whether the maximum number of individuals is exceeded. If this is the case, individuals will be deleted, until the number of individuals is back on track (lower the maximum number of individuals). In this case individuals with a high mortality assessment by the mortality rating algorithm have a high probability of being deleted.
The mortality assessment is based on the assessment of the fitness of individuals. However, the mortality rating algorithm can be exchanged for other mortality algorithm or be controlled by parameters. For example, it is possible to declare some individuals to be immortal, so they can not be deleted. By declaring, for example, the 
(
) best individuals to be immortal, it can be avoided, that they will be deleted and thus that one of the best individuals will be lost.
The mortality algorithm can furthermore access via the operator interface the status information of the genetic algorithm, to determine, for example, the number of previously generated individuals.