Context Diagrams There are three symbols used in these diagrams: Context Diagrams are used in the...

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Context Diagrams Context Diagrams There are three symbols used in these diagrams: Context Diagrams are used in the Analysis and Design phases as an analysis and design tool used to analyse processes occurring in a current information system and also to design a new information system. They help in identifying where problems may be occurring in an information system.

Transcript of Context Diagrams There are three symbols used in these diagrams: Context Diagrams are used in the...

Page 1: Context Diagrams There are three symbols used in these diagrams: Context Diagrams are used in the Analysis and Design phases as an analysis and design.

Context DiagramsContext Diagrams

There are three symbols used in these diagrams:

Context Diagrams are used in the Analysis and Design phases as an analysis and design tool used to analyse processes occurring in a current information system and also to design a new information system.

They help in identifying where problems may be occurring in an information system.

Page 2: Context Diagrams There are three symbols used in these diagrams: Context Diagrams are used in the Analysis and Design phases as an analysis and design.

Data FlowData Flow

Data flows describe the data being transferred, not the processing of the data.

E.g. “booking” is used rather than “validate booking”.

“Validate booking” is a process whereas the “booking” itself is the data.

Booking

Page 3: Context Diagrams There are three symbols used in these diagrams: Context Diagrams are used in the Analysis and Design phases as an analysis and design.

The whole system and a processThe whole system and a process

The oval shape is used to represent the whole information processing system (Context Diagram)

Booking system

The whole system

Page 4: Context Diagrams There are three symbols used in these diagrams: Context Diagrams are used in the Analysis and Design phases as an analysis and design.

External EntityExternal Entity

People, programs, organisations, other info systems that provide data to the system or receive output from the system.

Nouns are used to name external entities.External entities are things that are external

to the system in question.

students

Page 5: Context Diagrams There are three symbols used in these diagrams: Context Diagrams are used in the Analysis and Design phases as an analysis and design.

Context DiagramsContext Diagrams

The highest level of the data flow diagram.

General description of the system and its relationship with “the outside world.”

Restaurant System SuppliersDiners

Bookings

Orders

Invoice

Payment


1 Class Diagrams. 2 Overview Class diagrams are the most commonly used diagrams in UML. Class diagrams are for visualizing, specifying and documenting.

1 Class Diagrams. 2 Overview Class diagrams are the most commonly used diagrams in UML. Class diagrams are for visualizing, specifying and documenting.

Context Diagrams

Context Diagrams

Data flow diagrams IPT 2010. data flow diagrams A data flow diagram provides more detail at a lower then a context diagram. Data flow diagrams represent.

Data flow diagrams IPT 2010. data flow diagrams A data flow diagram provides more detail at a lower then a context diagram. Data flow diagrams represent.

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IS3320 Developing and Using Management Information Systems Lecture 16: Data-Flow Diagrams 1 (Intro to Context-Level diagrams) Rob Gleasure R.Gleasure@ucc.ie.

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Free-body diagrams Free-body diagrams are used to show the relative magnitude and direction of all forces acting on an object.

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Schematic Diagrams Schematic diagrams are used to graphically represent the components and interconnections of electrical circuits. Electronic schematics.

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Analysing Use Case Diagrams in a Calculus of Context-aware ...fsiewe/papers/siewe_al-alshuhai_2016.pdf · Use case diagrams are an excellent tool for capturing and analyzing the functional

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Use Case Modeling. Kendall & Kendall© 2005 Pearson Prentice Hall18-2 Commonly Used UML Diagrams The most commonly used UML diagrams are: – Use case diagram,

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Context-free grammars and BNF Syntax diagrams

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HSC Context and data flow diagrams ( DFD )

HSC Context and data flow diagrams ( DFD )

UNIT I UML DIAGRAMS INTRODUCTION TO OOAD · UML DIAGRAMS What is UML? Unified Modelling Language (UML) is the set of notations,models and diagrams used when developing object-oriented

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Learning question : How can genetic diagrams be used to solve problems?

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ELECTRICAL DIAGRAMS. INTRODUCTION Electrical diagrams are drawings in which lines, symbols, letter and number combinations are used to represent electrical.

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