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Re: FW: ACTION-9: Propose a new structure for the Use Cases and Requirements document

From: Arnaud Le Hors <lehors@us.ibm.com>
Date: Fri, 24 Aug 2012 09:17:41 -0700
To: public-ldp-wg@w3.org
Message-ID: <OF5BCED480.2887A69C-ON88257A64.0057E5AE-88257A64.005982F6@us.ibm.com>
[resent to the proper list]
See below.
Arnaud  Le Hors - Software Standards Architect - IBM Software Group

From:   "Steve Battle" <steve.battle@sysemia.co.uk>
To:     Arnaud Le Hors/Cupertino/IBM@IBMUS, Steve K 
Speicher/Raleigh/IBM@IBMUS, <michael.hausenblas@deri.org>, 
Date:   08/24/2012 08:45 AM
Subject:        FW: ACTION-9: Propose a new structure for the Use Cases 
and Requirements document

Arnaud, Steven, Michael,
I sent the following email to the mailing list yesterday, but as this was 
the first message I’d sent to the list, it appears to have been delayed (I 
have given archival approval ) . 
Anyway, the content is reproduced below, for yourself and the use case 
co-editors to review.
I’m happy to discuss this Monday.
Steve Battle
From: Steve Battle [mailto:steve.battle@sysemia.co.uk] 
Sent: 23 August 2012 18:05
To: public-ldp-wg@w3.org
Subject: ACTION-9: Propose a new structure for the Use Cases and 
Requirements document
The following is the proposed structure of the LDP 'Use Cases and 
Requirements' Document. Rather than basing this template on any one prior 
example, I've chosen to look to these as exemplars of a particular 
feature, with the aim that this document will combine the best of the 
best.  The main change is the relabeling of the existing use-cases as 
'User Stories', and the introduction of a new 'Use Cases' section that 
will catalogue the complete set of behaviours of LDP compliant systems. 
The text below is representative of the document outline, using wikitext 
to indicate section levels. I hope not to ignite any wars over the terms 
'user story', 'use case', and 'scenario' as used in different communities; 
aiming to be compatible with as many different approaches as possible, 
from lightweight to formal. The most contentious point may be the 
distinction between user stories and use cases, to allow the relationship 
between them to be something other than 1 to 1, as is often the case with 
larger multi-line user stories.
I invite comment on the layout (particularly from my co-editors), and if 
the response is favourable, I'll edit the wiki accordingly. The actual 
work on isolating, identifying, and documenting the use-cases will remain 
work to-be-done.
=Linked Data Platform Use Cases And Requirements=
==Scope and Motivation==
==User Stories==
===<USER STORY>===
A statement about system requirements written from a user or application 
perspective. They can be obtained during informal discussion with users, 
often as a prelude to a more formal requirements gathering process [1]. 
They are lightweight and informal and can run from one line to a paragraph 
or two.
(e.g. <
Analysis of the user story can reveal specific use-cases and 
non-functional requirements (e.g. <http://www.w3.org/TR/dap-policy-reqs/

>). We don't presume that each user story corresponds to a single use 
==Use Cases==
Functional requirements modeled as use cases. This section provides a 
catalogue of use cases, each of which may be derived from one or more user 
===<USE CASE>===
Use cases, while still telling a story, are more structured [2], 
cataloguing who does what with the system, for what purpose, but without 
dealing with system internals [3]. We would typically identify the use 
case with a reference number (see e.g. <http://www.w3.org/TR/rdb2rdf-ucr/

>), along with a description, actors, pre/post conditions, and behaviours. 
UML use case diagrams (a form of behaviour diagram) may be used, but 
aren't necessary. Use cases act like the hub of a wheel; with spokes 
supporting requirements review and traceability, scenario-based analysis, 
end-to-end testing, and integration with non-functional, or quality 
Scenarios are more focused still, representing a single instance of a use 
case. Scenarios may be lightweight narratives (e.g. <
http://www.w3.org/TR/media-frags-reqs/>), or modeled as interaction 
diagrams. Each scenario may lead to the development of one or more test 
cases (e.g. http://www.w3.org/TR/xquery-use-cases/)
===Accepted Requirements===
Use-Cases may document behaviours that are ultimately deemed out of scope. 
This section may identify use cases that are accepted (e.g. 
===Additional Functional Requirements===
This section lists supplementary functional requirements that are not be 
captured as use-cases. These may be specific algorithms, state-machines, 
business processes, or other behavioural models that define what a system 
is supposed to accomplish.
===Non-Functional Requirements===
This section lists non-functional or quality requirements, and the use 
cases they are derived from (if any) (e.g. <
http://dvcs.w3.org/hg/gld/raw-file/default/dcat-ucr/index.html>). These 
may be derived from and organized by quality attributes.
Including acknowledgement of input from other working groups (e.g. <
[1] Alistair Cockburn, Writing Effective Use Cases, ISBN: 0201702258.
[2] Derek Coleman, A Use Case Template: draft for discussion, <
[3] Ruth Malan, Dana Bredemeyer, Functional Requirements and Use Cases, <
Steve Battle
Semantic Engineer

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E-mail: steve.battle@sysemia.co.uk
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Received on Friday, 24 August 2012 16:18:21 UTC

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