This dataset includes trace information as well as details about the code structure for four open source projects (Chess, Gantt, iTrust, JHotDraw). Each subfolder that starts with JSON contains the following JSON files: classes.json:This file specifies the list of Java classes for each case study. superclasses.json: This file specifies the list of Java superclasses andn subclasses within a Java project. interfaces.json: This file specifies the list of Java interfaces and implementations within a Java project. fieldclasses.json: This file specifies the list of variables declared within a class. fieldmethods.json: This file specifies the list of variables used within a method. parameters.json: This file specifies the list of parameters and return values within a method. methods.json: This file specifies the list of Java methods, along with the class that each method belongs to for every system. methodcalls.json: This file specifies the list of method calls made within a Java project. requirements.json: This file specifies the list of requirements under consideration for each system. traces.json: This file specifies the requirement-to-method trace values for each requirement-to-method entry within the trace matrix for each system. Each subfolder that starts with MYSQL contains the equivalent MYSQL scripts for the JSON files above: classes.sql fieldclasses.sql interfaces.sql methodcalls.sql methodcallsexecuted.sql methods.sql parameters.sql requirements.sql fieldmethods.sql superclasses.sql traces.sql tracesclasses.sql