• Document: Modern Systems Analysis and Design Seventh Edition Jeffrey A. Hoffer Joey F. George Joseph S. Valacich Structuring System Process Requirements Learning Objectives ü Understand the logical ...
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Modern  Systems  Analysis and  Design Seventh  Edition Jeffrey  A.  Hoffer   Joey  F.  George Joseph  S.  Valacich Chapter    7 Structuring  System  Process   Requirements Learning  Objectives ü Understand  the  logical  modeling  of  processes  by   studying  examples  of  data  flow  diagrams   (DFDs). ü Draw  data  flow  diagrams  following  specific  rules   and  guidelines  that  lead  to  accurate  and  well-­ structured  process  models. ü Decompose  data  flow  diagrams  into  lower-­level   diagrams. ü Balance  higher-­level  and  lower-­level  data  flow   diagrams. Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 2 Learning  Objectives  (Cont.) ü Use  data  flow  diagrams  as  a  tool  to   support  the  analysis  of  information   systems. ü Discuss  process  modeling  for  electronic   commerce  applications. ü Use  decision  tables  to  represent  the  logic   of  choice  in  conditional  statements. Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 3 Process  Modeling FIGURE  7-­1 Systems  development  life  cycle  with  the  analysis  phase  highlighted Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 4 Process  Modeling  (Cont.) n Graphically  represent  the  processes  that   capture,  manipulate,   store,  and  distribute   data  between   a  system  and  its   environment  and  among  system   components. n Utilize  information  gathered   during   requirements  determination. n Model  processes  and  data  structures. Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 5 Deliverables  and  Outcomes n Context  data  flow  diagram  (DFD) ¨Scope  of  system n DFDs  of  current  physical  system ¨Adequate  detail  only n DFDs  of  current  logical  system ¨Enables  analysts  to  understand  current   system Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 6 Deliverables  and  Outcomes  (Cont.) n DFDs  of  new  logical  system ¨Technology  independent ¨Show  data  flows,  structure,  and   functional  requirements  of  new  system n Thorough  description  of  each  DFD   component Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 7 Data  Flow  Diagramming  Mechanics n Represent  both  physical  and  logical   information  systems n Only  four  symbols  are  used n Useful  for  depicting  purely  logical   information  flows n DFDs  that  detail  physical  systems  differ   from  system  flowcharts  which  depict   details  of  physical  computing  equipment. Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 8 Definitions  and  Symbols FIGURE  7-­2 Comparison  of  DeMarco   and  Yourdon and  Gane  and  Sarson   DFD  symbol  sets Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 9 Definitions  and  Symbols  (Cont.) n Process:  work  or  actions  performed   on  data  (inside  the  system) n Data  store:  data  at  rest  (inside  the   system) Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 10 Definitions  and  Symbols  (Cont.) n Source/sink:  external  entity  that  is   the  origin  or  destination  of  data   (outside  the  system) n Data  flow:  arrows  depicting   movement  of  data Chapter  7 Copyright  ©  2014  Pearson  Education,  Inc.  Publishing  as  Prentice  Hall 11 Developing  DFDs n Context  diagram  is  an  overview  of  an   organizational  system  that  shows:   ¨ the  system  boundaries. ¨ external  entities  that  interact  with  the  system. ¨ major  information  flows  between  the  entities   and  the  system. n Note:  only  one  process  symbol,  and  no   data  st

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