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SSADM

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... Analysis and Design Methodology. 4. Life Cycle Phases. Planning ... Menu and command structures. Prototyping report. 360 Develop Processing Specification ... – PowerPoint PPT presentation

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Title: SSADM


1
SSADM
  • Structured Systems Analysis and Design Methodology

2
Life Cycle Phases
  • Planning
  • Feasibility Study
  • Analysis
  • Design
  • Code and Unit test

4
3
Stages
  • 0. Feasibility
  • 1. Analysis - Current systems and problems /
  • requirements
  • 2. Business system option
  • 3. Define requirements - specify
  • 4. Technical Systems Options
  • 5. Logical system design
  • 6. Physical system design

4
Feasibility
  • Prepare for feasibility study
  • Define the problem
  • Select Feasibility Options
  • Assemble Feasibility Report

5
010 Prepare for feasibility study.
  • Context Diagram
  • Current Physical Level-1 DFD
  • Overview LDS (Logical Data Structure)
  • Requirements Catalogue
  • i.e. a list of all requirements

6
020 Define the problem.
  • Outline current and required environment
    description
  • Requirement catalogue
  • User Catalogue
  • Problem Definition Statement

7
Feasibility
  • 030 Select Feasibility Options
  • Action Plan
  • Feasibility options
  • 040 Assemble Feasibility report
  • Feasibility study report

8
Investigation of Current Environment
  • 110 Establish Analysis framework
  • Requirements catalogue
  • Context diagram
  • Current Physical DFD, level 1
  • Overview LDS
  • Agreed Systems Analysis and Design Method
  • 120 Investigate and define requirements
  • Requirements catalogue
  • User Catalogue
  • 130 Investigate current processing
  • Context diagram
  • Current physical DFM

9
  • 140 Investigate current data
  • Current Environment LDM
  • 150 Derive logical view of current services
  • Context diagram
  • Logical Data Store / Entity Cross-Reference
  • Logical DFM
  • Requirements Catalogue
  • Current Environment LDM
  • 160 Assemble Investigation Results
  • Current Services Description
  • Requirements Catalogue
  • User Catalogue

10
Data Store / Entity Cross-Reference
  • This is a matrix, with data stores across the top
    and entities down the side.

Data Store / Entity Diary Dog Chart Journal
Payment X
Dog X X
Stay X X
Owner X
11
Business System Option
  • 210 Define Business System Options
  • 220 Select Business System Option

12
Requirements Definition
  • 310 Define required system processing
  • Required system Logical LDM
  • User Roles
  • 320 Develop Required Data model
  • Produces the Required system LDM
  • 330 Derive System Functions
  • I/O structures
  • User Role/Function Matrix
  • Function Definitions

13
  • 340 Enhance Required Data model
  • Required system LDM
  • 350 Prototype I/O Interface
  • Menu and command structures
  • Prototyping report
  • 360 Develop Processing Specification
  • Required system LDM
  • ELHs
  • ECDs (Effect correspondence diagrams)
  • EAPs (Enquiry access paths)

14
  • 370 Confirm System objectives
  • Function Definition
  • Required System LDM
  • 380 Assemble Requirements Specification
  • Requirements Specification

15
Technical Systems Options
  • 410 Define TSOs
  • 420 Select TSO

16
Logical System Design
  • 510 Design user dialogues
  • Dialogue structure
  • Dialogue-level help
  • Dialogue control table
  • Menu Structure
  • Command structure
  • 520 Define update processing
  • ELHs
  • Entity Descriptions
  • Update Process Models
  • 530 Define Enquiry Processing
  • Enquiry Process Models
  • 540 Assemble the Logical Design
  • Logical Design

17
Physical System Design
  • 610 Prepare for Physical design
  • Application Development Standards
  • 620 Create Physical data design
  • First cut Physical data design
  • 630 Create Function component Implementation map
  • FCIM
  • Function definitions
  • 640 Optimise Physical Data design
  • Function Definitions
  • Physical Data design, optimised
  • Space estimation
  • Timing Estimation 

18
  • 650 Complete function specification
  • FCIM
  • Function definitions
  • 660 Consolidate Process Data Interface
  • FCIM
  • Function definitions
  • 670 Assemble Physical Design
  • Physical Design
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