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SSADM Version 4

SSADM Version 4. Stages of SSADM v4 annotated to show main uses of the three basic diagrammatic techniques. Notice how the diagrams carry forward from stage to stage becoming transformed from the existing physical system through a logical system and eventually to the required system.

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SSADM Version 4

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  1. SSADM Version 4 Stages of SSADM v4 annotated to show main uses of the three basic diagrammatic techniques. Notice how the diagrams carry forward from stage to stage becoming transformed from the existing physical system through a logical system and eventually to the required system. Key to abbreviations: c.p. = current physical diagram c.l. = current logical diagram r.s. = required system diagram DFD = dataflow diagram E.P.D. = elementary process description LDM = logical data model ELH = entity life history

  2. SSADM Version 4 Stage 0: Feasibility Step 010 Prepare for feasibility study overview LDS context diagram current physical level 1 DFD Step 020 Define the problem uses c.p.DFD and overview LDS Step 030 Select feasibility options subsets of DFD and LDS used for BSOs and TOs and for estimation of system size and complexity Step 040 Assemble feasibility report LDS included in environment descriptions RJP/SSADM 0/PP

  3. Step 110 Establish analysis framework Step 120 Investigate and define requirements Step 130 Investigate the current processing Step 140 Investigate current data Step 150 Derive logical view of current services Step 160 Assemble investigation results SSADM Version 4 Stage 1: Investigation of the current environment level 1 current physical DFD (c.p. DFD) overview LDS refine & validate LDM c.p. DFD converted to current logical DFD (c.l. DFD) in step 130 the c.p. DFD is updated from results of Step 120 amend LDM to support c.l. DFD and EPDs as required RJP/SSADM 1/PP

  4. SSADM Version 4 Stage 2: Business System Options Step 210 Define business system options DFDs and LDM may be used to support both these steps Step 220 Select business system options RJP/SSADM 2/PP

  5. SSADM Version 4 Stage 3: Definition of Requirements amend c l DFD to agree with BSO and LDS (this gives required system DFD) required system LDM prepared Step 310 Define required system processing Step 320 Develop required data model use r.s. DFD to identify update & enquiry functions Step 330 Derive system functions refer to r.s. LDM as necessary validate and enhance LDM from RDA Step 350 Develop specification prototypes Step 340 Enhance required data model Step 360 Develop processing specification use r.s. DFD and LDM for reference use r.s. DFD and LDM as inputs to entity/event modelling, creating ELHs, EAPs and ECDs Step 370 Confirm system objectives update required system LDM as necessary Step 380 Assemble requirements specification cross check LDM against all other products RJP/SSADM 3/PP

  6. SSADM Version 4 Stage 4: Technical Options LDM now part of requirements spec. which is input to this stage Step 410 Define technical system options Step 420 Select technical system options RJP/SSADM 4/PP

  7. SSADM Version 4 Stage 5: Logical Design Step 510 Define user dialogues requirements spec. input to this stage update entity descriptions in LDM, include state indicators on ELHs and create update process models Step 520 Define update processes Step 530 Define enquiry processes create enquiry process models Step 540 Assemble logical design check LDM and other logical design products for consistency RJP/SSADM 5/PP

  8. SSADM Version 4 Step 610 Prepare for physical design Stage 6: Physical Design Step 620 Create physical data design LDM is main input Step 630 Create function component implementation map Step 640 Optimise physical data design LDM is used for reference Step 650 Complete function specification Step 660 Consolidate process data interface Step 670 Assemble physical design RJP/SSADM 6/PP

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