• Views may be complex: an example line-segment view is 67 lines of code.

• Views may be error-prone if written by hand: storage and independence properties must be maintained.

• Difficulty of coding view types detracts from benefit of reuse.

• Automated assistance for making views is needed.

Views can be created in several ways:

• Textual specification, by hand.

• Graphical specification: click on corresponding parts of menus or diagrams.

• VIEWAS: (semi-) automatic generation of a view, e.g., as a linked-list.

• MKV: (semi-) automatic generation of a mathematical view, based on diagram connections.

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