Page 52 - Cloud computing: From paradigm to operation

1 Framework and requirements for cloud computing

Appendix II

Methodology and edition plan of this Recommendation
(This appendix does not form an integral part of this Recommendation.)

This Recommendation adopts a use-case-driven approach. Use cases are selected and elaborated first. Based
on these use cases, relevant requirements are derived. As an example shown in Figure II.1, one use case may
derive multiple requirements.

1. General 2. General 2. General
requirements for a requirements for b requirements for c

1.1 1.2 1.3 2.1 2.2 2.3 3.1 3.2 3.3

Main body

Appendix
Use case A
Use case B Use case C
Use case title
Figure + description
Example
Derived requirement items:
1.3, 2.1, 3.1, 3.2
(Refer to clause 1, 2, 3)
Y.3501(13)_FII.1

Figure II.1 – Methodology including mapping of use cases and requirements

The use-case-driven approach may also ease the preparation of future editions of this Recommendation. As
explained in Figure II.2, a new edition will include new use cases with derived new requirements.

Desired time Time

UC1 UC2 UC3 UC4 UC5 UC6

HL HL HL HL HL HL
Req Req Req Req Req Req
1 2 3 4 5 6

ITU-T Y.3501 edition 1
ITU-T Y.3501 edition 2
Y.3501(13)_FII.2
UC: Use case
HL Req: High-level requirement

Figure II.2 – Editions of this Recommendation
NOTE – For the sake of readability, this Recommendation describes the requirements with short titles. Exact description
of short titles is provided in relevant clauses of this Recommendation.
Table II.1 presents the edition plan of this Recommendation based on the progress of the corresponding
content.

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