One of the first steps in the planning phase of your deliverable and of the documentation set requires that you identify content elements for reuse.
Use the following factors as a guideline to identify content as a good candidate for reuse:
Two or more topics require the same content.
Two or more deliverables require the same content.
The content is typically subject to frequent changes during a release cycle or between releases.
Standardization of the text or phrase is vital for business or usability reasons.