Tier Strategy
Many options are available to a project team that wants the best and most flexible design strategy. At a minimum, any application built today that is intended to be around longer than a year or two without experiencing a major reworking must implement a minimum of three logical tiers. This minimum is specified because the traditional three-tier model needs further categorizing, for the following reasons:
The Business Services layer actually consists of two types of services: Business Context and Business Rule. The first type deals with the user interface as it pertains to filtering and cleansing information as it enters the system; for example, a value entered in one field limits the allowable values entered in another field. The ...
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