
This list hints at the comprehensiveness which a conceptual schema might possess.
As might be expected, database management systems differ in the degree of
comprehensiveness, and ease of use, of their conceptual schema facilities.
As the enterprise evolves, so the conceptual schema will have to be changed. If the
conceptual schema is an accurate model of the enterprise, then any change seen by the
enterprise as being a straightforward development in its way of doing business should
imply a straightforward change in the conceptual schema. On the other hand, no one
should be surprised if a radical change to the enterprise necessitates a radical change ...