9. Data Dictionary

If the system includes software and or a database. Then the system specification should include a data dictionary.

This serves two purposes.

It defines precisely the details of each major data structure.
It offers the opportunity to share common data structures within the system.

The second point is a good way of saving time and cutting down on debugging and testing as the validation of that structure only needs to be done once.

A data dictionary may include

tables, fields, records and relationships
constants, variables and data structures
validation that is required in the system
query structures

Challenge see if you can find out one extra fact on this topic that we haven't already told you

Click on this link: Creating a System Requirements Document