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This severely stresses urban water supply and sanitation systems , increasing competition for surface and ground water resources and deteriorating water quality . Human resource management stresses socialization , training , promotion through a hierarchy of grades , job rotation and appraisal systems while fostering competition among peers , hard work and commitment . The development of electronic trading systems and increasing competition between rival systems is leading to major changes in market structure . " For the past year we have been working with the DPA ( Defence Procurement Agency ) in selecting suppliers for the major systems , using competition wherever possible . Will Wilson 's book Simulating Ecological and Evolutionary Systems in C ( Cambridge University Press ) models a diverse range of biological processes and systems , including competition , foraging , predation , mating systems , and life-history optimization , by simulating large collections of interacting individuals .