From: Adam Lang <>
> A (good?) multi-tier application is the display client, whether VB, web,
> java, C++, that handles validation, display and communication with the
> middle tier.  Middle tier holds business logic and talks to the database
> system.

the problem with this is that valadation and business rules are often
strongly linked: what is valid may itself be part of the business logic.

> The strong point for AS/400 is the fact that multi-tier computing is
> unnecessary.  All the tiers reside on one box.

this removes my objection above. Yet another strong point for the

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