The complexity module scans the complete designs of the databases on your servers and generates a complexity score, which measures the approximate difficulty of moving your applications to what's next. The score is based on a number of factors including the size of the design and the numbers of different types of design elements, along with counts of specific Domino features that are hard to migrate. You can also specify keywords whose presence suggest that migration may be difficult. These include, for example, references to other proprietary internal systems or external code in DLLs.