Transcription of LECTURE 1. SYSTEMS DEVELOPMENT
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LECTURE 1. SYSTEMS DEVELOPMENT
I S 460 Notes Professor Yong Tan 1 LECTURE 1. SYSTEMS DEVELOPMENT INFORMATION SYSTEMS System A system is an interrelated set of business procedures used within one business unit working together for a purpose A system has nine characteristics A system exists within an environment A boundary separates a system from its environment Characteristics of a System Components Interrelated Components Boundary Purpose Environment Interfaces Constraints Input Output Information Technology Combination of computer technology (hardware and software) with telecommunications technology (data, image, and voice networks) Information SYSTEMS Turns data into information Includes: o Hardware and system software o Documentation and training materials o Job roles associated with the system o Controls to prevent theft or fraud o The people who use the software to perform their jobs SYSTEMS DEVELOPMENT life cycle Major Attributes of the Lifecycle The project o Moves systematically through phases where each phase has a standard set of outputs o Produces project deliverables o Uses deliverables in implementation o Results in actual information system o Uses gradual refinement Project Phases Planning o Why build the system?
Systems Development Life Cycle • Phases are not necessarily sequential o Sequential o Parallel • Each phase has a specific outcome and deliverable • Individual companies use customized life cycle Processes and Deliverables • Planning o System Request o Feasibility Analysis o Workplan • Analysis → System Proposal
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