AFM 341 Chapter 14 Notes.pdf

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Accounting & Financial Management
AFM 341
Clark Hampton

Chapter 14 SYSTEMS DEVELOPMENT METHODOLOGY  Systems development process: process by which applications are developed and maintained  System development life cycle [SDLC]: methodology that organizes systems development activities into 4 phases: systems investigation, systems analysis, systems design, systems implementation  Need a professional team to be systems' professional minions  4 phases: 1. Systems investigation:  objective = study current system, identify needed changes, solutions, propose solution, show it is feasible 2. Systems analysis:  objective = develop reqs for new system. Study current system + proposed solution in detail. Focus on needs of different users. 3. Systems design:  objective = develop physical realization of system. Design reports, forms, tables. 4. Systems implementation:  Objective = make apps, test system, train users, install system, convert from old to new system. Important issues in System Development: o LOOK at top diagram o Systems development should be aligned to business strategy o Business processes go through radical changes as part of systems development o Developing or modifying applications is key part of systems development. Know cost- benefit of each app o IT environment is important in how systems are built/deployed in orgs IT Environment 1. IT strategy: org`s broad vision for using IT to support org`s overall business strategy/process 2. IT infrastructure: organization of tech to support business processes. It is the way tech is used for recording/processing/storing/communicating data 3. IT function: organization of people responsible for acquiring/developing info systems + supporting end users 4. Systems development process: where apps are developed/used/maintained. Systems Development Models + Techniques o 2 problem solving aids = techniques | models  Techniques: methods for solving specific kind of problem. Ex: set of steps to recognize events  Models: help organize concepts in certain AOI into meaningful framework for problem solving. No explicit set of steps. The 4 SD Phases discussed below. 4 subparts: Objective | Tasks | Conducting phase | Application of models 1. SYSTEMS INVESTIGATION OBJECTIVES:  Purpose = study current system. Identify need for changes. Identify solutions. Assess feasibility of proposed solution.  Must know if enough benefits to start a project  Broad decisions about developing a system  Like looking for a house: need to calc costs, location, rent/buy TASKS:  Tasks to be done [look at top diagram] 1. Business strategy = study alignment of proposed system w/ business strategy  Accounting system modified for 3 reasons: 1. Changes in environment [major competitor etc] 2. Changes in tech 3. Problems in existing systems 2. AIS application = understand current applications + defects  Understand function of current application  Issue of compatibility of new system with old 3. Business process = know current process/effects of proposed system/benefits of it  Detailed review of system in this phase  Major costs in redesigning business process 4. IT environment = assess if proposed system is feasible for current IT strategy/infrastructure  Environment might have to grow to support new opportunities CONDUCTING SYSTEMS INVESTIGATION:  Purpose = quickly identify problems in existing systems, possible solutions, cost- benefit  High level understanding  Need experienced minions who can identify what info is critical without having enough data  And decide on a solution  Solution NOT firm commitment  Communicate investigation to users + mgmt  Feasibility report: outcomes of a systems investigation. Describes system problem, alternatives, recommended solution. Analysis shown to say solution is feasible  Report has 3 parts: 1. Executive summary: brief summary of problem + key recommendations + reasons for recommendation 2. Discussion: details of problem, method used for analysis, alternatives used, criteria used to evaluate, costs/benefits 3. Documentation: most detailed section. Tables of data/calculations/charts.  Discussion + documentation = very imp coz they give background for Systems Analysis MODELS/TECHNIQUES USED IN SYSTEMS INVESTIGATION:  USE overview activity diagram/workflow table These models help identify impact of proposed changes on business process/users   Detailed activity diagram = used in Systems Analysis phase 2. SYSTEMS ANALYSIS
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