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Comprehensive Overview of Basic CASE Models in Systems Analysis and Design

This document provides an in-depth exploration of fundamental CASE models utilized in systems analysis and design with Visible Analyst. It covers various modeling techniques, including Functional Decomposition Models (FDM), Entity Relationship Models (ERM), Data Flow Diagrams (DFD), and Object Class Models (OCM). The content emphasizes the significance of graphical representation in understanding system components and their interactions. By partitioning large systems into manageable subsystems, analysts can streamline specifications, enhance information flow, and improve overall system control.

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Comprehensive Overview of Basic CASE Models in Systems Analysis and Design

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  1. CSE 441: Systems Analysis & Design Basic CASE Models of Visible Analyst Lab2 Yusuf Altunel

  2. The Basic CASE Models • Functional Decomposition Model (FDM) - Business Model • Entity Relationship Model (ERM) - Data Model • Object Model (OCM) - Object Class Model • Process Model (DFD) - Data Flow Diagram

  3. StructuredModellingTechniques • Large systems can be partitioned for furtheranalysis • into component subsystems • or sub-functions. • Specifications for individual components • are easier and faster • than to definethan the total system. • The interaction between the parts • can be planned, designed and implemented • to reflect improved information flows and controls. • More than one person • can work with the same system in the network edition. OVERVIEW

  4. ENTITY RELATIONSHIP MODELING • Entity Relationship Modeling or Data Modeling • The technique used by Visible Analyst • for representing data. • The purpose ofthis technique is • to graphically demonstrate • how entities are related to one another. • An entity could be • Customer, Product, Inventory, Supplier, Sale, • or some other label generally in the form of a singular noun.

  5. ERD • ERD (Entity Relationship Diagram) • The diagramming technique • used for Data Modelling • Relationships between entities • are described in terms of their CARDINALITY - one-to-one - one-to-many - many-to-many

  6. Relationship cardinality ratio • Think up an example of a 1:1 relationship? • 1:1 • Think up an example of a 1:M relationship? • 1:M • How about a M:M relationship? • M:M A department has 1 manager A studenttakescourses Customers buying products

  7. DFD (Data Flow Diagram) • The diagramming technique used • for PROCESSMODELLING • The DFD consists of • data flows, • processes, • data stores, • external entities. • Methodologies used for Process Modeling: -Yourdon/DeMarco -Gane & Sarson -SSADM - Metrica. • Visible Analyst implements thesetechniques.

  8. Example of a DFD

  9. End of Lab-2

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