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This paper presents a case study of analyzing a legacy PL/1 ecosystem that has grown for 40 years to support the business needs of a large banking company. In order to support the stakeholders in analyzing it we developed St1-PL/1-a tool that parses the code for association data and computes structural metrics which it then visualizes using topdown interactive exploration. Before building the tool and after demonstrating it to stakeholders we conducted several interviews to learn about legacydoi:10.1109/wcre.2013.6671320 dblp:conf/wcre/AeschlimannLNW13 fatcat:hkheshujsvgfdbqqjshzzzbozm