A method and system for correlating out interactions, which occur due to one or a set of specific events, of an application, which is deployed in multiple adjacent tiers in an actual environment is described. First, a simulation environment corresponding to the actual environment is created. Then, specific events are led to the actual environment and the simulation environment. A pattern(s) of interactions, which are related with the specific events, between adjacent tiers in the simulation environment and a large number of interactions between adjacent tiers in the actual environment are obtained. Afterwards, interactions, which are related with the specific events, between adjacent tiers among the obtained interactions between adjacent tiers in the actual environment are correlated using a template of the obtained pattern(s) of interactions, which are related with the specific events, between adjacent tiers in the simulation environment as a template.