Capturing and Linking Use Cases and Concerns to Rich Pictures: Catalyst.gsm.uci.edu

1
Capturing and Linking Use Cases and Concerns to
Rich Pictures Catalyst.gsm.uci.edu

• Walt Scacchi, Ph.D.
• Systems Analysis and Design
• for ECommerce and EBusiness
• GSM 271/FEMBA 271
• Spring 2003

2
Use Case Review

• A Use Case tells a story of reaching a goal,
• or a set of stories about reaching or failing.

3
Use Case Review

• A UC story captures
• a relation (activity designated by a verb/verb
  phrase)
• the role/community/actor who performs the
  activity
• normal, exceptional and error scenarios
• Scenarios are narratives that describes a
  sequence of steps, actions or other activities
• Scenarios identify objects that the actor
  manipulates through the relation
• Objects have attributes which may be manipulated
  by steps in the relation

4
A Use Case Example

• UC 4 Place an order
• (Normal Scenario)
• 1. The clerk identifies the customer, each item
  and quantity.
• 2. System accepts and queues the order.
• (Exception Scenarios)
• 1a. Low credit Clerk takes prepayment
• 2a. Low on stock Customer accepts reduced...

5
Use Case Example in detail

• Place an order -- the relation as a verb phrase
• Clerk, Customer and System are the actors
• Order (as in purchase_order) is an object
  manipulated by the clerk and system
• Order has attributes customer-identifier,
  item, quantity, credit-status, etc.

6
Format for Capturing a Use Case

• UC Identifier (a verb phrase identifying the
  relation)
• Scenarios
• (Optional--extra credit) Use Case Diagram
• Items specific to the relation extracted from the
  Rich Picture
• UML has a modeling/diagramming construct called a
  Use Case Diagram, which is a more primitive
  subset of a Rich Picture.
• Search for details Use Case Diagram on the Web

7
Use Case Examples for a Corporate Portal
Catalyst.gsm.uci.edu
8
Enterprise Mandala
Fund, delegate, promote
Provide high-quality course content
Communicate, discuss, teach, research
Deans Office
UCI GSM
Communicate support faculty students
Faculty
Create/edit upload content
GSM staff
Download content
Edit/upload content
Do Email
Centralize IS support and content mgmt.
Access other Web content
Do Forum or Chat/IRC
Communicate, discuss, learn
Upload messages or bio content
Develop Test Catalyst
Help faculty, students, staff with h/w, s/w
network
Download content
Manage Catalyst content
MBA students
GSM IT Support Staff
An enterprise system rich picture for the UCI GSM
Catalyst System with hyperlinked descriptions of
the Use Cases and Concerns
9
Relations in Catalyst

• Create/edit upload content
• Download content
• note there are two instances of this relation in
  the rich picture
• Edit/upload content
• Upload messages/bio. content

• Do Forum or Chat
• Do Email
• Access other Web content
• Manage Catalyst content
• Develop Test Catalyst

10
Do Forum or Chat

• Faculty can request students in their courses to
  download or upload messages via a Discussion
  Forum or Chat
• Faculty or Students can download/upload messages
  for sharing with other students in their course
  at any time.
• (Exception) Faculty can remove messages from
  their Discussion Forums
• User constraint Messages that are deleted from a
  Discussion Forum cannot be retrieved
• User constraint Chat message content is not
  saved by Catalyst
• System constraint Discussion Forum message
  content may be lost if Catalyst Database is not
  backed-up.

11
Create/edit upload content

• Faculty (authors) create (insert) new content or
  edit (update) existing course content
• Faculty can transmit the content they create to
  Administrative staff for editupload into
  Catalyst, else Faculty upload their content into
  Catalyst
• Faculty/staff can only upload one type of course
  content at a time into Catalyst
• (Exception) Catalyst will allow existing content
  to be copied from one course to another without
  upload.
• Faculty can only edit (update) content they have
  individually created
• (Exception) Faculty may copy and paste content
  created by other Faculty from one part of
  Catalyst (Faculty Lounge) into their course
  content.
• User constraint Catalyst cannot verify if
  content uploaded is correct in any sense. User is
  responsible for correctness of content
• System constraint Catalyst will not allow
  content edit/upload if the Catalyst DBMS is not
  available

12
Download content

• Users (Faculty and Students) can search and
  download course content
• for courses Faculty have created or
• for messages or biography info. entered by
  Students in a course or
• (Exception) from course content designated for
  sharing by all Faculty (course syllabi and linked
  materials)
• User constraint Catalyst will not allow access
  to content except as allowed by GSM Deans policy
• System constraint Catalyst will not allow search
  or download of Catalyst content if Catalyst DBMS
  is unavailable.

13
Edit/upload content

• Faculty can transmit the content they create to
  Administrative staff (publishers) for editupload
  into Catalyst
• Administrative staff can only upload one type of
  course content at a time into Catalyst
• (Exception) Catalyst will allow existing content
  to be copied from one course to another without
  upload.
• User constraint Catalyst cannot verify if
  content uploaded is correct in any sense. User is
  responsible for correctness of content
• System constraint Catalyst will not allow
  content edit/upload if the Catalyst DBMS is not
  available

14
Upload messages/bio. content

• Students can download, update, then upload
  personal biography information for sharing with
  other users.
• Students (end-users) can upload messages for
  sharing with other students in their course at
  any time.
• (Exception) Students can sendreceive email from
  other students via Catalyst, without uploading
  these messages into Catalyst
• User constraint Catalyst cannot verify if
  content uploaded is correct in any sense. User is
  responsible for correctness of content
• System constraint Catalyst will not allow
  content edit/upload if the Catalyst DBMS is not
  available

15
Do Email

• Any user can access internal or external email
  systems via Catalyst to create, upload, download,
  update then upload messages for other users at
  any time.
• Catalyst does not manage email messages or
  message services
• (Exception) Users can create, upload, download,
  update then upload email messages via Catalyst,
  without uploading these messages into Catalyst.
• User constraint Users cannot use Catalyst to
  manage or keep track of personal/private email
  messages or message content
• System constraint An email server may fail to
  send or receive email messages with/without
  notifying email users
• (Exception) Email servers will notify users if
  sent mail cannot be delivered

16
Manage Catalyst content

• Developers create the representations, relations,
  and system components that provide users access
  to content managed by Catalyst.
• Catalyst is used to organize, store, query,
  retrieve or update content that is managed by
  Catalyst
• Catalyst uses a (relational) database management
  system to organize, query, retrieve or update
  content that is stored in its database
• (Exception) Catalyst stores data that identifies
  content, and controls access to content, stored
  as files in a networked file server, or as
  Web-based content accessed via the Web.
• User constraint Catalyst cannot be used to store
  arbitrary files for end-users.
• System constraint Catalyst cannot control
  updates to external content accessed via the Web.

17
Develop Test Catalyst

• Developers create the representations that other
  users utilize to create, insert, update or delete
  their content.
• Developers create, insert, update and delete
  content stored in Catalyst representations to
  test its proper operations
• (Exception) Developers cannot guarantee that all
  functions supported by Catalyst have been tested.
• (Exception) Developers cannot guarantee that all
  functions supported by Catalyst are re-tested
  every time any Catalyst function or operation is
  modified (updated).
• User constraint Developers expect that users
  will notify them if the users encounter anomalies
  in Catalyst usage.
• System constraint Catalyst system components may
  fail to operate correctly even though they have
  been tested.

18
Access other Web content

• Faculty can create content that contains Web
  hyperlinks
• Users can select hyperlinked items
• A selected item is downloaded into the Users
  client if the Web server can retrieve the item.
• (Exception) Users that select hyperlinked content
  will be disconnected from Catalyst after a
  certain elapsed time, unless they return to
  Catalyst
• User constraint Catalyst will not allow access
  to its content directly from the Web
• System constraint Catalyst may unexpectedly
  terminate a user session if a user accesses Web
  items that attempt to upload information into
  Catalyst, or launch applications unknown to
  Catalyst.

19
GSM Administrative Staff Communicate support
faculty students

• Communicate with Faculty and Students about the
  status and availability of course content
• Support and assist Faculty in getting content
  into Catalyst for download by Students

20
Deans Office Fund, delegate, promote

• Fund the development, usage and maintenance of
  Catalyst at UCI GSM.
• Delegate responsibility to manage Catalyst
  operations to UCI GSM GSM IS development staff.
• Promote the existence and capabilities of
  Catalyst to other institutions and users to bring
  more recognition, funding, and end-users to UCI
  GSM.

21
Faculty Provide high-quality course content

• Faculty are encouraged by Dean's Office to use
  Catalyst to provide high-quality course content
  by creating, uploading, editing and downloading
  content for UCI GSM courses.

22
Faculty Communicate, discuss, teach, research

• Faculty communicate concepts and discuss course
  problems and assignments with Students, as part
  of how they teach and do their research.

23
GSM IT Systems Support Staff Centralize IS
support and manage online course content

• Centralize, organize and provide IT Systems
  support and manage online content services for
  all Catalyst users.

24
GSM IT Systems Support Staff Help faculty,
students, staff with hardware, software network
systems

• Help support Faculty, MBA Students, GSM
  administrative staff and Dean's Office in their
  use of Catalyst and its components.

25
MBA Students Communicate, discuss, learn

• MBA Students are encouraged by Dean's Office to
  use Catalyst to download content, communicate and
  discuss content with other MBA Students and
  Faculty as a way to learn more about the content.
  MBA Students may include others previously
  affiliated with the UCI GSM, such as "alumni".