-Poor conceptual meaningful notation.
-To avoid the problem of layout algorithms and aesthetics of diagrams, they prefer boxes and lines and do nothing more than represent (primary-foreign key) relationships among resulting tables.(a few exceptions)
-lack of built-in methodology support.
-poor tradeoff analysis or user-driven design preferences.
-poor design verification and suggestions for improvement.
jim items answered the question on March 12, 2019 at 14:53
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