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LIBSYS — Layered Architecture Example
publish date: 2026/06/10 21:07:22.557097 UTC
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The LIBSYS system uses a five-layer architecture to provide controlled electronic access to copyright material from university libraries. Arrange the LIBSYS layers in order from top (user-facing) to bottom (data sources).
Individual library databases (DB1, DB2 … DBn)
Library Index
Distributed Search, Document Retrieval, Rights Manager, Accounting
LIBSYS Login, Forms and Query Manager, Print Manager
Web Browser Interface
Correct Answer
(1) Web Browser Interface
(2) LIBSYS Login, Forms and Query Manager, Print Manager
(3) Distributed Search, Document Retrieval, Rights Manager, Accounting
(4) Library Index
(5) Individual library databases (DB1, DB2 … DBn)
Explanation
The LIBSYS five-layer architecture from top to bottom: Web Browser Interface → LIBSYS Login / Forms and Query Manager / Print Manager → Distributed Search / Document Retrieval / Rights Manager / Accounting → Library Index → Individual databases (DB1–DBn). The bottom layer is the individual databases in each library.
Reference
Software Engineering, Ian Sommerville, 10th edition