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To: Nolan S. Toone who wrote (23299)	11/22/1999 1:43:00 PM
From: JC Jaros	Read Replies (1) \| Respond to of 64865

Thanks Nolan. I tried finding '4 tier architecture' and couldn't find anything. What is the 'Business logic' component? Also, what is Esparto? -JCJ

To: Nolan S. Toone who wrote (23299)	11/22/1999 2:58:00 PM
From: Thomas Mercer-Hursh	Read Replies (1) \| Respond to of 64865

You are probably [unfortunately] right about your guess at what they are trying to convey about 4 tier, but I would go one step further and say that any of the serious players in distributed architecture, e.g., Forte, now a division of Sun, switched to calling everything N-tier quite some time ago because the optimal configuration for any given distributed implementation can not only include many "levels" or tiers, but each level can itself include many different types of services. Thus, the ideal architecture isn't a string of three or four pieces arranged on a linear string, but a network of interrelated components which get assigned to particular machines within the network depending on the specifics of the application and the nature of the network links (slow/fast, reliable/not, etc.)