A first code version is received. The first code version includes a plurality of code features, such as methods or classes. A second code version is received. The second code version includes a plurality of code features. The first code version is executed. A first plurality of code features executed during the execution of the first code version are determined. A second plurality of code features differing between the first and second code versions are determined. The first and second plurality of code features are compared. An indication is provided that a code feature is potentially relevant to the code behavior if the code feature is present in the first plurality of code features and in the second plurality of code features.