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SSADM Structured Systems Analysis and Design Methodology.

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

1 SSADM Structured Systems Analysis and Design Methodology

2 4 Life Cycle Phases Planning Feasibility Study Analysis Design Code and Unit test

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 DiaryDog Chart Journal PaymentX DogXX StayXX OwnerX

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

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

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