Software artefact traceability is widely recognised as an important factor for the effective development and maintenance of a software system. Unfortunately, the lack of automatic or semi-automatic supports makes the task of maintaining links among software artefacts a tedious and time consuming one. For this reason, often traceability information becomes out of date or it is completely absent during software development. In this working session, we discuss problems and challenges related to various aspects of traceability in software systems.