Library components and containment: Arrange the following into a meaningful order that reflects how smaller units build up to larger systems — Pages, Books, Book rack, Catalogue, Library.

Introduction / Context:
Information organization moves from smaller physical units to larger systems. Here we must order elements commonly found in a library ecosystem by structural and functional dependencies.

Given Data / Assumptions:

• Elements: Pages, Books, Book rack, Catalogue, Library.
• Catalogue is a system describing the collection held in the library.

Concept / Approach:
Pages compose books; books are placed on racks; racks and catalogued metadata exist to serve the library as a whole. The catalogue is meaningful in the context of the library’s collection.

Step-by-Step Solution:
Pages → Books (pages bound together).Books → Book rack (physical storage).Catalogue (descriptive index) supports discovery of the stored books.All of the above operate within the Library.

Verification / Alternative check:
Library science practices confirm that cataloguing describes items owned/held; racks are physical infrastructure.

Why Other Options Are Wrong:
They misplace racks before books are defined, or put the library before the constituent materials are conceived.

Common Pitfalls:
Assuming the catalogue precedes the existence of the collection; in practice it reflects it.

Final Answer:
Pages, Books, Book rack, Catalogue, Library