[Year 12 SofDev] Use Case dilemma (s)

Wed Nov 24 16:54:12 EST 2010

Hi Kevork

I found the attached sample of a SRS on the following website:
http://nkhalid.seecs.nust.edu.pk/SE/

There is also some resources on UML and Use Cases.

Regards

Jenny Bean

Head of Technology

Oakleigh Greek Orthodox College

From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au]
On Behalf Of Kevork Krozian
Sent: Tuesday, 23 November 2010 10:06 PM
To: Year 12 Software Development Teachers' Mailing List
Subject: Re: [Year 12 SofDev] Use Case dilemma (s)

Hi Robert,

Thanks for the attachment and the explanations. It will help many of us
trying to come to terms with the expectations of the Use Case diagrams for
the course.

The problem arises when there are multiple sources explaining the same term
.

I take it you feel the examples in the attached sample are not valid use
cases namely, eat food, drink wine, cook wine ? 

We will continue our discussion....  

BTW do you have anything similar for SRS's ? I can get the whole IEEE Std
830-1998 standard but was wondering how much information and to what level
of detail a SAC would require a SRS .

Eg. A key knowledge and a key skill  in AOS 31 respectively are 
  . composition of an SRS and purposes of documenting an analysis in this
form and
. write an SRS to document the requirements, constraints and scope .

Quoting from the SRS standard document:

4. Considerations for producing a good SRS

a) Nature of the SRS;

b) Environment of the SRS;

c) Characteristics of a good SRS;

d) Joint preparation of the SRS;

e) SRS evolution;

f) Prototyping;

g) Embedding design in the SRS;

h) Embedding project requirements in the SRS.

In addition the Parts of an SRS are listed as :

Table of Contents

1. Introduction

1.1 Purpose

1.2 Scope

1.3 Definitions, acronyms, and abbreviations

1.4 References

1.5 Overview

2. Overall description

2.1 Product perspective

2.2 Product functions

2.3 User characteristics

2.4 Constraints

2.5 Assumptions and dependencies

3. Specific requirements (See 5.3.1 through 5.3.8 for explanations of
possible

specific requirements. See also Annex A for several different ways of
organizing

this section of the SRS.)

I notice in the assessment handbook for Outcome 31 ( Unit 3, Outcome 1 ) the
reference to SRS covers one criterion worth 5 marks out of 40

. Production of a Software Requirements Specification in which the
functional and non-functional requirements, scope and constraints are
documented using appropriate tools p42  Assessment handbook
<http://www.vcaa.vic.edu.au/vcaa/vce/studies/infotech/infotechhb-2011-2014.d
oc> 

It would be really nice to have one sample SRS at the standard and content
as required for SAC31 to make sense of that otherwise seems a really long
report of a few dozen or more pages at this stage.

With thanks

Kevork 

From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au]
On Behalf Of Timmer-Arends
Sent: Tuesday, 23 November 2010 6:02 PM
To: Year 12 Software Development Teachers' Mailing List
Subject: Re: [Year 12 SofDev] Use Case dilemma (s)

Hello Kevork

arrow directions make sense for both include and extend if you think of them
as saying "this extends that" - "this" being the tail-end and "that" being
the use case pointed at. So, for example, "order wine extends food order" -
in other words it adds to its functionality. You can do the same for
includes - unfortunately your example doesn't have one.

As for the association with data, DFDs and use cases are not the same and
don't serve the same purpose. Use cases are about the system doing something
useful for the user and I guess the wikipedia example is trying to
illustrate this without getting too technical (??). I imagine if we are
talking about an information system then it a use case would ordinarily
involve information in some way

 For what its worth, I have attached a doc I prepared some time ago in
preparation for the new SD.

Regards

Robert T-A

----- Original Message ----- 

From: Kevork Krozian <mailto:kevork at edulists.com.au>  

To: 'Year 12 Software Development Teachers' Mailing List'
<mailto:sofdev at edulists.com.au>  

Sent: Tuesday, November 23, 2010 8:24 AM

Subject: [Year 12 SofDev] Use Case dilemma (s)

Hi folks,

I have attached a Use Case from Wikipedia and also used in Mark's brilliant
online notes. I have discussed it with contacts at tertiary level and there
is uncertainty about the representations.

Firstly, there are a number of use cases within the system that do not have
any data processing yet appear eg. Eat food, cook food, drink wine.

Thinking back to DFDs each process has to have data processing underpinning
eg. Deliver order is not a valid process unless there is a data component
such as deliver invoice OR pay invoice or transfer money is not a process
unless it is to request receipt or update invoice. 

I hope I am making sense. The consensus is that these use cases are not part
of the system.

Secondly, the arrows on includes and extends are in reverse positions . Has
anyone given any thought as to why that is ??

Speak soon

Kevork Krozian

Edulists Creator Administrator

www.edulists.com.au

tel: 0419 356 034

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