IEC 61631-3 is a standard for languages for Programmable Logic Controller (PLC) Programs. One language within this standard is Structure Text, which is a language similar to Pascal. In this project, data flow and call graph graphs should be created for Structured Text programs. Data flow graphs represent the data dependencies between program statements. A call graph represents the call dependencies between procedures. The input is an abstract syntax tree of Structured Text programs (see project above). Remark: It is also possible to split the task into two independent projects, one for the data flow and one for the call graph.