abstract = "This paper introduces Incentive Method to handle both
hard and soft constraints in an evolutionary algorithm
for solving some multi-constraint optimisation
problems. The Incentive Method uses hard and soft
constraints to help allocating heuristic search effort
more effectively. The main idea is to modify the
objective fitness function by awarding differential
incentives according to the defined qualitative
preferences, to solution sets which are divided by
their satisfaction to constraints. It does not exclude
the right to access search spaces that violate some or
even all constraints. We test this technique through
its application on generating solutions for a classic
infinite-horizon extensive-form game. It is solved by
an Evolutionary Algorithm incorporated by Incentive
method. Experimental results are compared with results
from a penalty method and from a non-constraint
setting. Statistic analysis suggests that Incentive
Method is more effective than the other two techniques
for this specific problem.",