Chapter 7 Notes

Chapter 7 Notes - Chapter 7 Using Data Flow Diagrams...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Chapter 7 Using Data Flow Diagrams Systems Analysis and Design Kendall & Kendall Sixth Edition 2 Learning Objectives ± Comprehend the importance of using logical and physical data flow diagrams (DFDs) to graphically depict movement for humans and systems in an organization ± Create, use, and explode logical DFDs to capture and analyze the current system through parent and child levels ± Develop and explode logical DFDs that illustrate the proposed system ± Produce physical DFDs based on logical DFDs you have developed ± Understand and apply the concept of partitioning of physical DFDs
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 3 Major Topics ± Data flow diagram symbols ± Data flow diagram levels ± Creating data flow diagrams ± Physical and logical data flow diagrams ± Partitioning ± Event driven modeling ± Use case and data flow diagrams 4 Process Modeling ± Process modeling ± Representation of the processes that capture, manipulate, store and distribute data between a system and its environment and among system components ± Represents data flows through the system as determined by organizational rules, decisions, and policies. ± Utilize information gathered during requirements determination ± Structure of the data is also modeled in addition to the processes ± Complex Process: ± process may require analysis through a number of levels of diagram in order to break it down into functional components that are sufficiently low level to be termed elementary processes. ± If there is sufficient interest in any given process to analyze it further, then clearly it is not an elementary process. ± Elementary Process ± Simple & discrete functions that require no further analysis ± can only occur on or below a level 1diagram, within the business model
Background image of page 2
3 5 Process Modeling ± Deliverables and Outcomes ± Set of coherent, interrelated data-flow diagrams ± Context data-flow diagram (DFD) ± Scope of system ± DFDs of current system ± Enable analysts to understand current system ± DFDs of new logical system ± Technology independent ± Show data flows, structure and functional requirements of new system ± Project dictionary and CASE repository 6 Process Modeling ± Decomposition Diagram ± A Process Model that breaks a system into processes and sub-processes showing increasing detail. ± Shows top-down functional decomposition of the system's structure. ± Data-flow Diagrams (DFD) ± A process Model consisting of Data Flows, Data Stores, and Data Transformations. ± Graphically illustrate movement of data between external entities and the processes and data stores within a system ± Depict: ± System inputs ± Processes ± outputs
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 7 Process Modeling ± Procedures of Representing Elementary Processes ± Structured English ± Simple Declarative Sentences (Get, Find, Record,. ...), Conditional ± Decision Structures (If, Then, Else,. ..), Iteration (Do until. ..). We are dealing here with Process Logic.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/18/2008 for the course CSIS 2210 taught by Professor Aakash during the Spring '08 term at Stockton.

Page1 / 31

Chapter 7 Notes - Chapter 7 Using Data Flow Diagrams...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online