The Tiered Approach
Since this catalog describes patterns that help you build applications that run on the J2EE platform, and since a J2EE platform (and application) is a multitiered system, we view the system in terms of tiers. A tier is a logical partition of the separation of concerns in the system. Each tier is assigned its unique responsibility in the system. We view each tier as logically separated from one another. Each tier is loosely coupled with the adjacent tier. We represent the whole system as a stack of tiers. See Figure 6.1.
Figure 6.1. Tiered approach
Client Tier
This tier represents all device or system clients accessing the system ...
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