In real-life situations, the modifications that a single aspect of the software has undergone may be simple (only a few lines of code have changed) up to heavy and massive (many modifications spread across multiple files of the code). In the latter case, backporting may become tedious and inefficient and should only be undergone if the older version of the software is really needed in favour of the newer (if, for example, the newer version still suffers stability problems that prevent its use in mission-critical situations).