N-tier application terminology
there is a confusion of using layer and tier to refer components of a n-tiered application.
Based on artical [1], n-tier is a term for application level dividents while layer is a smaller dividents within a tier. According to [1], n-tier application has Presentation tier, Middle tier And Data tier. Inside Middle tier there is Business Logic layer, Data Access Layer and Shared Components such as Authentication, Validation etc.
Data Tier refers to the relational database where data is maintained.
[1]MSDN, "Walkthrough: Creating an N-Tier Data Application",
http://msdn.microsoft.com/en-us/library/bb384570.aspx
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