6 modeling system requirements
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A model represents aspects of a system and helps clarify, simplify, and communicate system design. Types of models include mathematical, descriptive, and graphical models. Models created during analysis include entity-relationship diagrams and activity diagrams. Models created during design include screen layouts, system flowcharts, database schemas, network diagrams, and structure charts. An entity-relationship diagram defines data storage requirements using entities, attributes, and relationships.
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5 investigating system requirements
The document discusses investigating system requirements during the analysis phase of systems analysis and design. It describes gathering information through techniques such as conducting interviews, observing processes, building prototypes, and distributing questionnaires. This information is then used to define functional and non-functional system requirements, which specify what the system must do and characteristics like performance and security. Requirements are validated through reviews with relevant stakeholders.
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6 modeling system requirements
- 1. Modeling System Requirements Systems Analysis and Design
- 2. Models and Modeling • A model is a representation of some aspect of the system being built. • The purpose of models: – models help the analyst clarify and simplify the design – Models assist in the communication between system users and developers and foster understanding
- 3. Models and Modeling • Types of models – Mathematical Models • Formulas that describe technical aspects of the system – Descriptive Models • Narrative memos, reports or lists that describe some aspect of a system – Graphical Models • Diagrams and schematic representations of some aspect of the system
- 4. Models Used in Systems Analysis and Design • Models created during analysis phase – Entity-Relationship Diagram – Activity Diagram • Models created during the design phase – Screen/Report Layout – System Flowchart – Database Design/Schema – Network Diagram – Structure Chart (HIPO)
- 5. Entity Relationship Diagram • An entity relationship diagram is a model used to define the data storage requirement. – Data entities • The things the system needs to store information about • Contains an identifier and attributes
- 6. Entity Relationship Diagram • A simple ERD: Customer Order A customer can place zero or more orders Order must be placed by exactly one customer
- 7. Entity Relationship Diagram • Cardinality Symbols of Relationships Exactly One (Mandatory) Zero or One (Optional) Zero or more (Optional) One or more (Mandatory)
- 8. Entity Relationship Diagram • An expanded ERD with attributes shown: Customer Cust Number Name Address Phone Order Order ID Order Date Amount Order Item Item ID Quantity Price
- 11. Network Diagram • A computer network diagram is a schematic depicting the nodes and connections amongst nodes in a computer network
- 12. Structure Chart (HIPO) • A structure chart is a design tool that pictorially shows the relation between processing modules in computer software.