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MAPPING DATA FLOW DIAGRAMS INTO STRUCTURE CHARTS

MAPPING DATA FLOW DIAGRAMS INTO STRUCTURE CHARTS. Transform and Transaction Analysis. Requirements. System Design. Detailed Design. Implementation. Installation & Testing. Maintenance. Goals and Concepts of Structured Analysis and Design:. structured development of software:

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MAPPING DATA FLOW DIAGRAMS INTO STRUCTURE CHARTS

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  1. MAPPINGDATA FLOW DIAGRAMS INTO STRUCTURE CHARTS Transform and Transaction Analysis

  2. Requirements System Design Detailed Design Implementation Installation & Testing Maintenance

  3. Goals and Concepts of Structured Analysis and Design: • structured development of software: • methodology • notation (DFD, SC) • integration of analysis and design • quality control (cohesion, coupling) • based on the flow of information (data) • provides proven heuristics

  4. The Focus is the Mapping • prepare and analyse a Data Flow Diagram - DFD • prepare and check a Structure Chart - SC

  5. Design ... ... is an activity concerned with making major decisions, often of a structural nature. ... builds coherent, well planned representations of programs that concentrate on the interrelationship of parts at the higher level ... [P. Freeman]

  6. Structured Analysis and DesignInformation Flow Analysis 1 - specify the flow of information in your system => DFD 2 - identify typical structural patterns in the DFD => analysed & annotated DFD 3 - use a proven heuristic to map DFD into SC => first SC 4 - refine and check your Structure Chart => final SC

  7. Two Major Structural Patterns -Two Major Alternatives : • Transform (Flow) Analysis • Transaction (Flow) Analysis

  8. Transform Flow: input-driven center of transformation output-driven

  9. Transform Flow Characteristics • the system has a single, coherent objective • transformation center executes algorithms, data transformation, database manipulation, ... • input-driven processes filter, check and translate external data flows • output-driven processes format results for presentation to the environment (user) • multiple paths to obtain input

  10. Transform Analysis:mapping heuristic i1 o1 o2 ct1 i2 ct2 o3 sys I-ctrl P-crtl O-ctrl i1 i2 ct1 ct2 o1 o2 o3

  11. Transaction Flow: action-path T reception-path T ... transaction center

  12. Transaction Flow Characteristics • single line of reception processes • transaction: a single data item that includes all necessary information for execution • transaction center evaluates transaction & initialises correct action-path => distribution • action-paths implement (clearly) different types of functionality => execution • an action-path could be a complete (sub-)system with transform flow characteristics

  13. Transaction Analysis: mapping heuristic r1 sys r2 r2 trc r1 trc s1 s2 i1 i2 i1 cot o1 cot i2 o1

  14. Transaction Analysismay include Transform Analysisas an element.

  15. Transform Analysis as element of Transaction Analysis r1 sys r2 r2 trc r1 trc s1 s2 i1 i2 i1 cot o1 cot i2 o1

  16. End of Section 3d coming up: more about transform analysis

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