Control and process
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This document discusses control and process modeling for software design. It describes three primary objectives of analysis: to describe customer requirements, establish a basis for software design, and define requirements that can be validated. It also discusses different modeling techniques used in analysis, including data flow diagrams (DFAs), control flow models, state diagrams, and process specifications. These analysis models act as a bridge between initial system descriptions and later software design.
Control and process
- 1. CONTROL AND PROCESSBY:-ARPIT SHAH(08-CEG-45) ANKUR SHAH(08-CEG-44)
- 2. Topics
- 3. Analysis
- 4. Bridge between the system description and the design model.The system level description that describes overall system functionality as it achived by applying software,hardware,data,human etc….Software design that describes the software application.Elements of analysis model
- 6. Three primary objectivesTo describe ehat customer require.To establish a basis for the creation of a software design.To define a set of requirements that can be validated ance the software built.
- 8. Data-flow modelDFA takes an input-process-output view of system.That is data objects flows into the software,are transferred by processing elements and result data objects flow out of the software.The DFA is presented in a hirarchical fashion.
- 9. Hierarchical DFAThe 1st data flow model(sometimes called as a level 0 DFA or context diagram) represents the system as a whole.Subsequent data flow diagram refines the context diagram providing increase detail with each subsequent level.
- 10. Level of DFA
- 12. Level 1 DFA
- 13. Level 2 DFA
- 14. Control flow modelA large class of application are “driven” by events rather than data,produce control information rahter than reports or display,and process information with heavy concern for time and performance.
- 15. Level 1 CFD
- 16. State diagram for CFD
- 17. Control specificationIt represents the behaviour of the system in two different ways.State diagram that is a sequential of behaviour.A program activation table that is a combinatorial specifaction of behaviour.
- 18. Control specificationIt describes behaviour of the system,but it gives us no information about the inner working of the process that are activated as a result of this behaviour.
- 20. Process specificationThe process specification is used to describe all flow process that appear at the final level of refinement.It includes narrative text,PDL description of process algorith,mathematicaleqation,tables etc…..
- 21. Process specificationBy providing it,ypo can create a “mini-spec” that is serves as a guide for design of the software component that will implement the bubble.
- 22. PAT
- 23. Difference between control and processThe PAT represent information containrd in the state diagram in the context of process not state.