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The Project ProcessInception - initial planningElaboration - refining the designConstruction - building the systemTransition - installation support
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InceptionAsk important questions such as
What is the system going to do? What is the business case for the system?Are we better off buying a system off the shelf?
Development ArtefactsProject specificationEthical reviewEvent tablesInitial use case diagrams + descriptionsClass diagramEarly prototype – a “smoke and mirrors” model of
how the system will workTesting – test plans – test framework – usability
testing
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The Big LieProject development is a nice clean and tidy
process
Uncertainty and Proofs of conceptShould the main screen be blue or green?Will the language I am using work on that version of
the operating system?How do I process this list of data to format it in a
specific way?I am really not very clear on what the user wants
with this single requirement?Is it possible to connect this system to Oracle rather
than SQL server?
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Digesting the Problem – The SpecificationAs a self employed computing consultant you
encounter a large number of people whilst involved in your networking activities. One consequence of these activities is that you accumulate a huge number of business cards/flyers. These documents contain a large quantity of useful information that needs to be input into suitable database system.
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Role Play the ScenarioWho are you?What are you doing?Under what circumstances will you perform
the task?
(If you are not clear on any of these points then you must return to the client and find out.)
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Refined SpecificationThe consultant sits at their desk with a stack of
business cards and flyers. They pick up a business card and start to input the details into system. The first field they enter is the name of the company. While doing this the system looks up the company name to see if it is already on the system. The next field the user enters is the name of the contact. Whilst dong this, the list of contacts for that company is displayed such that if the contact is already on the system the user may move onto another business card. At this point the user should have the opportunity to update the details on the system should they note that some aspect has change e.g. email address.
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The Event TableProbably the most useful tools for digesting
the problem Informs your use casesInforms your class diagramDon’t get hung up on it being rightBetter to add more events and discount them
laterUnderstanding will still be fuzzy at this stage
of the game
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Address Book Event TableSubject Verb Object ResponseUser Views Address
ListAddresses are listed by the system
User Filters Address List
Address list is filtered based on pattern
User Adds Address Address is added to the system
User Updates Address Address is updated on the system
User Deletes Address Address is deleted from the system
System Validates Address Address data is accepted or error is displayed
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Identify Candidate Events from the SpecificationThe consultant sits at their desk with a stack of
business cards and flyers. They pick up a business card and start to input the details into system. The first field they enter is the name of the company. While doing this the system looks up the company name to see if it is already on the system. The next field the user enters is the name of the contact. Whilst dong this, the list of contacts for that company is displayed such that if the contact is already on the system the user may move onto another business card. At this point the user should have the opportunity to update the details on the system should they note that some aspect has change e.g. email address.
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Some Filtering RequiredNot events but still contain important
information about the system“consultant sits at desk”“pick up a business card”
Are these the same thing?“input the details”“enter the company name”“enter the name of the contact”
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Identify the Verbs in the Event Table
Subject Verb Object ResponseUser Views Address
ListAddresses are listed by the system
User Filters Address List
Address list is filtered based on pattern
User Adds Address Address is added to the system
User Updates Address Address is updated on the system
User Deletes Address Address is deleted from the system
System Validates Address Address data is accepted or error is displayed
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This Informs the Selection of Use Cases
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The Subject Column Identifies the Actors
Subject Verb Object ResponseUser Views Address
ListAddresses are listed by the system
User Filters Address List
Address list is filtered based on pattern
User Adds Address Address is added to the system
User Updates Address Address is updated on the system
User Deletes Address Address is deleted from the system
System Validates Address Address data is accepted or error is displayed
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Create Use Case DescriptionsUse Case Name (Short two or three word name)
List Addresses
Use Case Description (Short description)
The user views a list of addresses in the system
Use Case Author(s) (Who wrote this)
Matthew Dean
Actor(s) (Who does this)
User
Locations (Where does this happen)
On-line
Primary pathway (What is the normal “happy path” for this use case?)
List addressesUser enters the systemA list is displayed to the user at system start
Alternate pathways (What other paths are there that are not the “happy path”?)
There is no data in the system – a message is displayed saying soUser applies filterA filtered list is displayed to the userUser clears filterFull list is displayed to the user
Exception pathways (What could possibly go wrong?)
Database connection failsError displayed to the user advising of connection problem
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ExerciseExtended SpecificationOn the module web site you now have the
extended specification for the project bank. Working in teams select one of the features from the specification and brain storm the following.
Flesh out a detailed scenarioEvent table (Subject – verb – object –
response)What candidate actors / use cases do you
come up with?