Management 287

1
Management 287

• Designing On-Line Information Systems

2
Todays Action Plan

• Discuss Final Report Outline
• Discuss Project Planning, Develop Charter,
  Requirements Statement, and Schedule
• Discuss Event Modeling
• Review ER and DFD Methodology
• Discuss Verification and Validation
• Risk Analysis and Scheduling
• Group Report Due at the End of Class Today

3
Final Report Outline on Website
4
Software Development Pyramid / Stack
5
Context Model

• The Business Environment
• Boundaries and Interfaces within the Business
  Environment
• Functions, Processes, and Flows
• Social and Technical Dimensions

6
Event Model

• System Response to Each Business Event
• Maps Inputs to Outputs
• Processing Specifications for System Functions
• Business Rules and Event Dictionary
• Drives the User Interface Sequencing
• System Requirements from the Users Viewpoint and
  Describes Appropriate System Behavior

7
Information Model

• Static Data Map
• Data Modeling Task (E-R, etc)
• Enterprise-wide Coordination

8
The Charter
9
The Charter

• Vision
• Background
• Marching Orders
• Goals
• Options
• Objectives
• Authority
• Critical success factors, etc
• Why or Rationale
• Project Plan, and Functional as well as
  Operational Requirements

10
The Charter is a Contract and a Business Plan

• Goals and Goal Statement
• Objectives
• Evaluation Criteria
• Solution Options

11
Goals and Goal Statement

• Clear
• Unambiguous
• Concise
• Measurable!!

12
Objectives are not the Same as Goals They are

• Solutions to Problems
• Exploits Opportunities
• The Rationale Behind the Future Requirements
• Support the Goals
• Clear, Concise, and Measurable
• IR AC IS and x-factors
• Prioritize Objectives

13
Evaluation Criteria

• How to Measure Results Against Goals
• X-factors
• Objectives ? Evaluation Criteria
• Cost Evaluation Criteria
• Independently Cost Justified, Cost to Procure,
  Cost to Implement, . . .
• Usability, Reliability, Security,
  Maintainability,Impact Resistance, Size, Weight,
  Interoperability, Response Time
• Implement a Quality Vector Rating Scheme

14
Solution Options

• Do Nothing
• Evaluate Solution Options

15
The Charter

• Goals
• Objectives
• Courses of Actions
• Solution Scope
• Project Plan
• Roles and Responsibilities
• Critical Success Factors

16
The Context Model
17
The Context Model

• Data Flow Diagram 1979 - DeMarco
• Process
• Data Flow
• External Agent
• Data Store
• Path of Data Through an Organization

18
A Process Transforms Data but also Conserves It
a Verb

• Ship Books
• Take Order
• Present Catalog
• Bill Customer

19
External Agents

• Nouns
• Departments
• Customer
• Employee

20
Data Flow

• Stimulus and Response
• Made up of Data
• Carry out Business Events
• Data Flow Elements Defined in The Information
  Model

21
Data Store

• Repository or Storage Area
• File Cabinet, etc . . .

22
The Event Model
23
The Event Model

• Defining the Systems Requirements from the
  Users Point of View
• List Business Events
• Each event is given a detailed definition in the
  event dictionary
• Then data elements are used in the information
  model
• System Behavior from User Perspective

24
An Event is a Subject-Verb-Object

• Events are Business, not System-Based
• Example Customer Orders Book (subject-verb-objec
  t)

25
Deliverables

• Event List
• Event Dictionary see page 87
• Event Matrices Relates Events to Business
  Locations or to System Function
• See pages 92 and 93
• User Interviews

26
The Information Model
27
Entity-Relationship Diagram

• Entity
• Noun ( customer, order,etc..)
• Rectangle
• Relationhip
• Line Between two Entities
• Cardinality
• Attributes Describe the Entity

28
Matrices

• Matrices Relate Entities to Other Parameters in
  Your Model
• See pages 152-155

29
V V

• Open Discussion