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Structured Systems Analysis and Design Methodology

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Presentation on theme: "Structured Systems Analysis and Design Methodology"— Presentation transcript:

1 Structured Systems Analysis and Design Methodology
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 User Catalogue 130 Investigate current processing 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 160 Assemble Investigation Results Current Services Description 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 Stay Owner

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 350 Prototype I/O Interface
Required system LDM 350 Prototype I/O Interface Menu and command structures Prototyping report 360 Develop Processing Specification 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 670 Assemble Physical Design Physical Design

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