1004INT Information Systems

Week 8

Modelling Tools, DFDs & Organizational Context

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

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)

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

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

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

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

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

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

information systems more effective • Context diagrams distinguish internal and external entities for your organization • Excel drawing tools and tips for lab work