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Lecture05
1.
Object Oriented Software
Modeling and Design CE 350 Abdel-Karim Al-Tamimi, Ph.D. [email_address] http://faculty.yu.edu.jo/altamimi Al-Tamimi 2011 ©
2.
3.
4.
Documenting Use-Cases Al-Tamimi
2011 ©
5.
Documenting Use-Cases Al-Tamimi
2011 ©
6.
7.
8.
Use-Case Template Example
Part 1 Al-Tamimi 2011 © Use case name Name of the use case Use case ID ID of the use case Super use case The name of the generalized use case to which this use-case belongs Actor(s) The name of the actor(s) who participates in the use case Brief description A description showing how this use case adds value to the organization, that is, what the purpose or role of this use case is in enabling the actors to do their job Preconditions The conditions that must be satisfied before this use case can be invoked Post-conditions The conditions that will be established as a result of invoking this use case sucessfully
9.
Use-Case Template Example
Part 2 Al-Tamimi 2011 © Flow of events A step-by-step description of the interactions between the actor(s) and the system, and the functions that must be performed in the specified sequence to achieve a user goal Alternative flows and exceptions Major alternatives or exceptions that may occur in the flow of events Priority The development priority of this use case Non-behavioral requirements The non-functional requirements of the system such as hardware and software platform requirements, performance, security, … etc Assumptions All the assumptions made about the use case Issues All outstanding issues regarding the use case Source Reference materials relevant to the use case
10.
11.
Al-Tamimi 2011 ©
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
Step 3 :
Creating an initial use-case diagram Al-Tamimi 2011 ©
23.
24.
25.
26.
Step 5 :
Identifying/refining candidate business (domain) classes using textual analysis Al-Tamimi 2011 © Use case: Schedule Delivery Use case ID: UC-300 Actor: Order Processing Clerk Description: The Order Processing Clerk selects an order from the list of filled sales orders . The system displays the sales order details, member’s telephone number and address . The Order Processing Clerk enters the delivery date and time after talking with the member over the phone . The system records the delivery date and time in a dispatch request to the delivery team .
27.
Step 5 :
Identifying/refining candidate business (domain) classes using textual analysis Al-Tamimi 2011 ©
28.
29.
30.
31.
32.
33.
Basic vs. Alternative
Flow Al-Tamimi 2011 ©
34.
Basic vs. Alternative
vs. Exception Flows Al-Tamimi 2011 © Basic Flow Alternate Flow 1 Alternate Flow 2 Alternate Flow 3 Alternate Flow 4 Exception Flow 1 Exception Flow 2 Exception Flow 3
35.
Step 1 :
Developing base use-case descriptions Al-Tamimi 2011 © Use case name Place Order Use case ID UC-100 Super use case The name of the generalized use case to which this use case belongs. Actor(s) Customer Service Assistant Brief description A Customer Service Assistant places an order and then submits it for processing. Preconditions The member must have registered with the system. Post-conditions The Customer’s order will be directed to the order processing department for processing.
36.
37.
Step 1 :
Developing base use-case descriptions Al-Tamimi 2011 © Alternative flows and exceptions At any time the Customer Service Assistant can decide to suspend the ordering process and come back to it later, or to cancel the order. Priority High Non-behavioral requirements The system should be able to handle 20,000 new orders per day. Assumptions Issues Is there any limit on the amount of an order? Source User Interview Memo 21, 8/9/01
38.
Step 2 :
Structuring Use-Cases Al-Tamimi 2011 ©
39.
40.
41.
42.
Step 3 :
Developing Instance Scenarios Al-Tamimi 2011 © Parent use case name Place Order Parent use case ID UC-100 Instance name A sales order form is received but the membership number is missing. Instance ID UCIS-100-1 Environmental conditions and assumptions The name (Peter Chan) and signature of the member are available in the system. Inputs A sales order form
43.
Step 3 :
Developing Instance Scenarios Al-Tamimi 2011 © Instance flow description The Customer Service Assistant enters “Peter Chan” to find the member record. The system then displays a list of members which match the member’s name. The Customer Service Assistant repeatedly selects a member record. The system displays the signature of the member when a member record is selected. The Customer Service Assistant selects “Place Order”. A new order form and order ID are then generated and displayed. The Customer Service Assistant selects items from the catalog and adds them to the order. The Customer Service Assistant submits the order for processing. The system records the order and forwards it to the Order Processing Clerk. Outputs The sales order is placed.
44.
Step 4 :
Prioritizing Use-Cases Al-Tamimi 2011 © Priority Rank Use Case Reason High Process Order Directly improves the efficiency of the business process and affects the system architecture. High Place Order Same as above High Find Member Record Included as part of the Place Order use case. Medium Order Goods Ordering goods is less often than processing order but still is one of the major business processes. Medium Deliver Goods Can improve the control of stock level. Low Update Membership Record Small impact on the system architecture. Low Register New Member Same as above.
45.