Another good CASE tool to use is Microsoft Visio. It has many features to make the creation of these logical models less laborious. It can import data and automatically build models. It can import database design information allows for the reverse engineering of a database to include relationships. It can do organization charts, network designs and many more. You can build and link the designs and even layer a design. This is one of my favorite features. It comes with a huge library of symbols and automatic snapping and connecting lines. Once you create a design you can use it in Microsoft Biztalk server and with Visual Studio.Net to create real-time living diagrams of processes and network monitoring.
This is not meant to be a commercial for Microsoft. These just happen to be tools that I use.
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