In and for software projects, arrangements for permitting a user to understand how the spatial locality of a function call may have changed with respect to any changes in a function definition. This permits an analysis of different workflows which use the same function, wherein the definition of the function may have changed. To the extent that there might be corresponding changes in the workflows which use such a function, the user will readily develop an idea of why some workflows changed and some did not. The invention method and apparatus determine and display deltas (changes) between different versions of a file where the function call occurs.