Data mining concepts and techniques can help in solving many problems. Useful knowledge may be hidden in the data stored. This knowledge, if extracted, may provide good support for planners, decision makers, and legal institutions or organizations. Hence Pattern discovery, as one of the powerful intelligent decision support platforms, is being increasingly applied to large scale complicated systems and domains. It has been shown that it has the capacity to extract useful knowledge from a large data space and present to the decision makers. This will contribute to the detection of illegal activities, the governance of systems, and improvements in systems.