Changes to configuration items will occur throughout the project caused
by a range of event such as changes in a
requirement, changes in available technologies and products, and so on.
These changes need to be managed by a formal change
management process to ensure impacts are investigated and handled
appropriately. Change management is therefore an important part of
configuration management.
Within a change management system, changes are classified
by severity: Class 1 changes are major changes and involve
form, fit or function; and Class 2 changes are minor
changes such as documentation update and material substitution. In most
change management systems, customers must be involved in agreeing
to Class 1 changes but will normally only be informed
of Class 2 changes. Other change management systems are
often implemented with more than two classes, but at least
two classes are required for a useful configuration management system.
Other topics in our resources on Systems Engineering related to Change Management include: