1

A system comprising a database which stores the system meta data, application meta data and rule meta data of the information system, which represent the structure of the information system, in tables and fields with triggers on the tables to ensure that the integrity of the system is maintained, and one or more clients which load the system meta data, application meta data and rule meta data from the database into a meta system object with rules on the meta system to ensure that the integrity of the system is maintained during each step of development without having to test every combination of behaviour at run-time.

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2

A system as claimed in Claim 1 where system meta data, application meta data and rule meta data is loaded from the database into one or more client frameworks to define and from which to generate the information system clients.

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3

A system as claimed in Claim 1 where rules on the database and the clients ensure the validity of system meta data, application meta data and rule meta data thus maintaining the integrity of the system.

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4

A system as claimed in Claim 1 where validations of the system meta data, application meta data and rule meta data can be performed at the client, in a middleware application through which data is passed between the client and the database, on the database or any combination of these before the data is committed to the database.

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5

A system as claimed in Claim 1 where rule meta data, which is executed by the database and clients call the same dynamically loaded function libraries.

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6

A system as claimed in Claim 1 where clients permit only references to existing objects and options which are computationally compatible, as defined in the meta data, thus maintaining the integrity of the system during each stage of development.

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7

An information system substantially as herein described above and illustrated in the accompanying drawings.

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