Text mining is a technique that can be applied in order to discover new knowledge from collections of unstructured text documents (Kim et al., 2008). By applying text mining towards BM patents’ abstracts, words depicted by each BM patent could be caught with a keyword vector. Because the meaning of chance in KeyGraph would be found by analysing the connected clusters, text mining in this study aims to depict the practical meaning of clusters, i.e., PSS concepts in which technology clusters are employed. Accordingly, the technology clusters identified by KeyGraph are interpreted as a keyword vector of the patents, which commonly cite the technology clusters; thus, the technological chances between the clusters are interpreted and knowledge as strategic insights for PSS innovation are obtained. Table 1 summarises the complementary role of two methods in the proposed approach.