Methods of identification of external effects of functioning of industrial clusters. The aim of the paper is to present methods used to identify the external effects of the industrial clusters. One of them is to evaluate a regional growth regression with a cluster index as one of the explanatory variables. Such regression should also implement a concept of a spatial character of regional growth what means that condition of the region depends also on the situation of the neighborhood. The second suggestion for testing the effects of clusters is to verify an agglomeration effects in total economy.