1. 1004INT Information Systems Week 8 Modelling Tools, DFDs & Organizational Context

2. Last week in context Week 7 – Choosing hardware and designing a network for your project business –Justification of design on the grounds of scalability, accessibility, redundancy & interoperability –Using spreadsheets for data presentation Next – Considering people and what they do in organizations

3. Week 8 Objectives Develop an understanding of steps in the System Development Life Cycle To explore how organizations interact with their operating environment To understand how Data Flow Diagrams may be used as an analysis tool How to use Excel to complete diagrams for physical and logical analyses of project businesses (related to tutorial exercises)

4. Activities Presentation on System Development Life Cycle & Short Quiz Introduction to Module 5 and DFDs as analysis tools & Short Quiz Workshop: Using Excel drawing tools to create logical & physical structure diagrams

5. Quiz 1 - SDLC What does SDLC stand for? Systems Development Life Cycle How many “phases” are in the SDLC? Five In order, what are the five “phases”? 1.Planning 2.Analysis 3.Design 4.Implementation 5.Support/Maintenance

6. Quiz 1a - Feasibility Why is a feasibility study done? To determine suitability of system development Which of the following tests are parts of a feasibility study? –Operational feasibility –Organizational feasibility –Schedule feasibility –Financial feasibility –Software feasibility –Technical feasibility –Economic feasibility

7. Quiz 2 - DFDs What does “DFD” stand for? Data Flow Diagram What are DFDs used for? To analyse business processes and show how data moves through an organization What are the four components of a DFD? Data Flows Data Stores Processes Entities

8. Quiz 2a - DFDs What is the highest level DFD called? Context diagram What is its purpose in business analysis? To determine all of the external entities that an organization interacts with To determine the “border” to the organization’s information system

9. What you should take away today (Information) Systems inside an organization are usually developed following a life cycle model Organizations and people interact in many ways and DFDs are one of the tools for analysis of how data moves because of these interactions DFDs can be used to design more effective information systems Context diagrams distinguish internal and external entities for your organization Excel drawing tools and tips for lab work