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1 MAPPING DATA FLOW DIAGRAMS INTO STRUCTURE CHARTS Transform and Transaction Analysis.

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Presentation on theme: "1 MAPPING DATA FLOW DIAGRAMS INTO STRUCTURE CHARTS Transform and Transaction Analysis."— Presentation transcript:

1 1 MAPPING DATA FLOW DIAGRAMS INTO STRUCTURE CHARTS Transform and Transaction Analysis

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

3 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 4 The Focus is the Mapping prepare and analyse a Data Flow Diagram - DFD prepare and check a Structure Chart - SC

5 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 6 Structured Analysis and Design Information 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 7 Two Major Structural Patterns - Two Major Alternatives : Transform (Flow) Analysis Transaction (Flow) Analysis

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

9 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 10 Transform Analysis: mapping heuristic i1 i2 ct1 ct2 o1o2 o3 sys I-ctrlP-crtlO-ctrl i1i2ct1ct2o1o2o3

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

12 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 13 r1 r2 r1 sys trc s1s2 i1 i2 coto1 i1 i2 cot o1 trc Transaction Analysis: mapping heuristic

14 14 Transaction Analysis may include Transform Analysis as an element.

15 15 r1 r2 r1 sys trc s1s2 i1 i2 coto1 i1 i2 cot o1 trc Transform Analysis as element of Transaction Analysis

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


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