Creating and Maintaining
There are many commercial tools that can be used to create and maintain software traceability links; however, over time these links tend to decay. Creating missing links, and maintaining existing ones can be extremely challenging in practice. In commercial tools, such as DOORS, drag-and-drop features are useful for creating links, but features for effectively maintaining and evolving those links are lacking.
As a result, many researchers have focused significant time and effort over the past decade exploring solutions for automatically generating and maintaining software traceability links. Objectively, this is very much an open area of research. Some specific projects and papers are listed below.