System Development Life Cycle : SDLC

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????????????

• ???????????????????????????????????????
• ????????????????????????????
• ????????????????? ? ????????????????????????

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??????????????????(System Development Life Cycle
SDLC)
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??????????????????(System Development Life Cycle
SDLC)

• ???????????????????????
• (Project Identification and Selection)
• ???????????????????????
• (Project Initiation and Planning)
• ????????????? (Analysis)
• ?????????? (Design)
• ??????????????????? (Implementation)
• ?????????????? (Maintenance)

???? 137-305
???? 137-401
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??????????????????????? (Project Identification
and Selection)

• ???????????????
• ????????????????
• ?????????????
• ?????????????????????????????
• ????????????????????????
• ????????????????????? ???????????????????????
• ????????????????????????????????????
• ???????????????????????????????????????????????
  ?????????????????
• ??????? H/W ??? S/W ??????? version ?????
  ??????????????
• ????????????? ?????? ?????????????
• ??? Value Chain ????????????????????????????????
• ???????????????????????????
• ????????????????????????????????? ????????
• ??????????????????????????????????

6
??????????????????????? (Project Initiation and
Planning)

• ????????????????????????????????????????
• ???????????????????????????????????????
• ?????????????????????????????? ?
• ?????????????
• ???????????????????
• ?????????????? ?????????
• ???????????
• ????????
• ???????????????????
• ?????????????????? (Gantt Pert)
• ??????????????????

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System Request Forms
System Review Committee
Considered by Feasibility Study
Technical (??????)
Operational (????????????)
Economical (???????)
Result
Approved
Rejected
Asked for Changed
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????????????? (Analysis)

• ?????????????????????????? ???????????????????????
  ????????????????????? ??????????????????????????
  ?????????????? ???????????????????????????
• ???????????????????????? ???? ????????,
  ???????????????????????????, ??????, ?????????,
  ??????????????????, ????? ????????????????????????
  ????????????????????????????
• ???????????????????? ??? Joint Application
  Development (JAD)

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??????????????????????

• Inputs
• Outputs
• Processes
• Performance
• Controls

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?????????????????????????????(Process Modeling)
????????????????????????? (Data Modeling)

• ????????????????? ???
• E-R Diagram ??? Data Dictionary
• ????????????????????????? ???
• Data Flow Diagram
• ??????????????????????? ????
• Structure English
• Decision Table
• Decision Tree

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????????? Data Flow Diagram
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????????????? DFD

• Process
• Process ?????????? Input ??? Output Data flow
• ????? input ??????????
• ????? output ??????????
• ??????? process ???????????????? ????
  ?????????????
• Data Store
• ????? data flow ??? data store ????? data store
• ????? data flow ??? external entity ????? data
  store
• ????? data flow ??? data store ????? external
  entity
• Data store ????????????????? ????
  ????????????????
• External Entity
• ????? data flow ??? external entity ?? external
  entity
• ??????? external entity ????????? ???? ??????
• Data Flow
• data flow ?????????????????????????-????
• data flow 1 ????????????????? 2 ????
  ????????????????
• ????? data flow ?? join ??????????????????????
• Data flow ?????????? process ????
• Data flow ??????? data store ?????????? update
  ????????? ???????????????????

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Balancing DFD

• When decomposing a DFD, you must conserve inputs
  to and outputs from a process at the next level
  of decomposition

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Context Diagram
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Data Flow Diagram Level 0
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Data Flow Diagram Level 1
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Data Flow Diagram level 1
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The progression of models from logical to physical
Current Logical Data Flow Diagram
New Logical Data Flow Diagram
New Physical Data Flow Diagram
???????????????????????????????????????
?????????????????????????????????????????????????
??????????????????????????????????????????????????
???????????? ???? Hardware, Software, Data
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Logical Data Flow Diagram level 0
????????????????????
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Physical Data Flow Diagram 0 ???????????????????
?
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Process logic

• ??????????????????????? ????
• Structure English
• Decision Table
• Decision Tree

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Logical Data Flow Diagram level 0 Hoosier
Burgers inventory system
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Structure English
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Decision Table
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Decision Tree
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• ???????????????????????? ? ????????
• ??? Value Chain ????????????????????????????????
• ???????????????????????????
• ????????????????????????????????? ????????
• ???????????????????????????????????

• ????????????????????????????????????????
• ???????????????????????????????????????
• ?????????????????????????????? ?
• ?????????????
• ???????????????????
• ?????????????? ?????????
• ???????????
• ????????
• ???????????????????
• ?????????????????? (Gantt Pert)
• ??????????????????

• ????????????????????????
• ???????????????????????????????????????? Data
  Flow Diagram
• ?????????????????????? (Process Logic)

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??????????????????? (Design)

• ????????????????????
• (Output Design)
• ?????????????????????
• (Input Design)
• ?????????????????????? (Data Stores)
• ?????????????????
• (System Processing)
• ??????????????? (Software Design)

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????????????? ??????????? 2 ???? ???

• ??????????????????? (logical Design) ???
  ???????????????????????????????????????????????
  ????
• ??????????????????????????? ??????????????????????
  ??????????????????????? ??????????????????????????
  ??
• ????????????????????
• ????????????????????????? logical design
• ???????????????????????? (Data Dictionary)
• ?????????????????????? ???????????????????????????
  ???????????? ???????????????????????????????
  ??????????????????? ??????????????????????????????
  ??

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????????????? ??????????? 2 ???? ???

• ??????????????? (Physical Design)???
  ??????????????????????????? ??????????????????????
  ?????????????????????? ?????????????????????????
  ???????????????

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??????????????????????????

• ??????????????????????????
• ???????????????????? (Output Design)
• ????????????????????? (Input Design)
• ?????????????????????? (Data Stores)
• ????????????????? (System Processing)
• ??????????????? (Software Design)
• ???????????????????????????????

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?????????????????????????

• ?????????????????????????? ????????
• ???????????????
• ?????????????????????????? ?????????????
• ?????????????

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????????????????????????????
???????????????????? (Effective) ???

• ???????????????? Requirements ??????????????
  users ???????
• ?????????????????? users

?????????????????? (Reliable) ???

• ??????????????????? Errors ????? ???
• ???????????????????? Errors ?????
  ???????????????????
• ?????????????????????????? ????? ??????????
  Error ????????????

???????????????????????? (Maintainable) ???

• ????????????????????????????? ???????????
  ??????
• ?????????????????????????????

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??????????????????????? ???
1. ?????????????????

• ?????????????????? ??? User ??????????????? ????
  ?????? User ?? input ????????????????? ??????????
  User ?????? Output ??????????
• ????????????????????????????????? User ???? ???
  ??????

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??????????????????????? ???
2. ?????????????????

• ???????????????????????????????????
  ?????????????? ??????????
• ???????????????????????????????????????????????
  ????????
• ???????????? ?????????????????????????????
  ???????? ????
• ?????? barcode
• ???????????????????????????????????????????????
  ??????????
• ???????????
• ???????????????????????????????????????????????
  ???????????
• ????????????
• ??????????? ???????????????????????????????

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??????????????????????? ???
3. ????????????????????

• ????????????????????????????????????
• ?????????? Modular Design
• ??????????? Module ????? Function ?????

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??????????????????????? 1

• ????????? ??????? 5 ?? ?????????????????????
  ?????????????????? (Prototype) ???????????????????
  ???????
• ??????????????? ??????????????????????? 2