You may have been assigned a CASE or a drawing tool to develop conceptual data models. U...

The CASE tools may lead to the faulty designs by the user and it is difficult to understand and use the tool takes more amount of time since there involves newer versions of the tool and learning process changing with the implementation which is tedious.Finally the present CASE tools to draw E R model are a slightly cost effective.The E-R notations that did not translate well are the design of multivalued attributes and derived attributes followed by associative or related entity.We can design the notations which cannot be drawn by tool manually or by editing using paint and pasting again in the design without any change in the specification.