Assignment 3 Question 3

As-Is Use Case Model of Blackboard LMS

Actors

• Instructor
• Student

Use Cases

1. Instructor grades assignment
2. Student submits assignment
3. Student views grades
4. Instructor posts class materials
5. Student takes quiz

UML Use Case Diagram

"Submit Assignment" Use Case Narrative from "System As-Is" Perspective

Pre-Conditions

• Student must be logged in
• Student has navigated to the course page
• Assignment is open
• Student has not submitted before or assignment allows multiple submissions

1. The use case starts when the student clicks the "Assignment" navigational link.
2. Student clicks name of assignment {V1, V2}
3. Student adds completed assignment to submission {V3, V4}
4. Student adds any comments for submission
5. Student clicks submit

Variations

• V1: Assignment is closed
  1. System prompts student with message saying assignment is not active
  2. Student may now navigate away from the page
• V2: Student has submitted previously and multiple submissions not allowed
  1. System prompts student that they have already submitted for this assignment
  2. Student may now navigate away from the page
• V3: Student submits text submission
  1. Student clicks "Write Submission"
  2. Student writes in the presented box
• V4: Student attaches file for submission
  1. Student clicks "Browse My Computer"
  2. Student selects the correct file(s) in the pop-up window and clicks "OK"

Use Case Rankings

Use Case	Importance to Users	Architectural Impact	Frequence of Use
Instructor Grades Assignment	13	2	13
Student Submits Assignment	13	2	13
Student Views Grades	13	5	13
Instructor Posts Materials	8	5	5
Student Takes Quiz	3	8	5