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8 Chapter 8: Evaluating Alternatives for Requirements, Environment, and Implementation Systems Analysis and Design in a Changing World, 3rd Edition www.goupee.com
8 Chapter 8: Evaluating Alternatives for Requirements, Environment, and Implementation Systems Analysis and Design in a Changing World, 3rd Edition www.goupee.com
8 Learning Objectives Prioritize the system requirements based on the desired scope and level of automation for the new system Describe the strategic decisions that integrate the application deployment environment and the design approach for the new system Determine alternative approaches for system development Systems Analysis and Design in a Changing World, 3rd Edition 2
8 Learning Objectives (continued) Evaluate and select a development approach based on the needs and resources of the organization Describe key elements of a request for proposal and evaluate vendors’ proposals for outsourced alternatives Develop a professional presentation of findings to management Systems Analysis and Design in a Changing World, 3rd Edition 3
8 Overview Chapter explains last three activities of analysis Prioritize systems requirements Generate and evaluate alternatives Review recommendation with management Refocus project direction Transition from discovery and analysis to solutions and design Set direction for design and implementation of solution system Systems Analysis and Design in a Changing World, 3rd Edition 4
8 Project Management Perspective Project manager and senior technical members of project team work together Eight areas of project management Scope Human resources Time Procurement Cost Communications Quality Risk Systems Analysis and Design in a Changing World, 3rd Edition 5
8 Deciding on Scope and Level of Automation Scope determines which business functions will be included in system Level of automation is how much computer support exists for functions included in level Scope creep Requests for addition of system functions after requirements defined and decision has been made Users typically request more business functions than budget allows Systems Analysis and Design in a Changing World, 3rd Edition 6
8 Determining the Level of Automation Low level Simple computer records keeping Medium level Midrange point which combines features from low and high alternatives High level System takes over processing of business function Systems Analysis and Design in a Changing World, 3rd Edition 7
8 Selecting Alternatives Entire group of alternatives is evaluated together to provide “big picture” view of proposed system Key criteria that are used: Strategic plan Economic feasibility Schedule and resource feasibility Technological feasibility Operational, organizational, and cultural feasibility Systems Analysis and Design in a Changing World, 3rd Edition 8
8 Defining the Application Deployment Environment Configuration of: Computer hardware System software Networks Development Tools Existing environment generally considered and compared with proposed environment Systems Analysis and Design in a Changing World, 3rd Edition 9
8 Hardware, System Software, and Networks Older batch-mode applications on centralized mainframe Stand-alone applications on mini- and personal computers On-line interactive applications Distributed applications Web-based applications Systems Analysis and Design in a Changing World, 3rd Edition 10
8 Deployment Environment Characteristics Compatibility with system requirements Compatibility among hardware and system software Required interfaces to external systems Conformity with IT strategic plan and architecture plans Cost and schedule Systems Analysis and Design in a Changing World, 3rd Edition 11
8 Development Tools Programming languages, CASE tools, software used to develop application software Java and Visual Studio.NET are examples Application deployment environment decisions limit development tool choices Operating system environment Database management system (DBMS) Distributed software standard Systems Analysis and Design in a Changing World, 3rd Edition 12
8 Existing Processing Environment at RMO Systems Analysis and Design in a Changing World, 3rd Edition 13
8 Processing Environment Alternatives Systems Analysis and Design in a Changing World, 3rd Edition 14
8 Choosing Implementation Alternatives Variations on obtaining system Facilities management outsource all IS support Packaged software, Turnkey system, ERP system Custom-built software systems In-house development Selection dimensions Buy vs. build In-house vs. outsource Systems Analysis and Design in a Changing World, 3rd Edition 16
8 Implementation Alternatives Systems Analysis and Design in a Changing World, 3rd Edition www.goupee.com 17
8 Selecting an Implementation Alternative Identifying Criteria for Selection Comparisons can be difficult Different proposed systems have strengths in different areas Three major areas to consider General requirements Technical requirements Functional requirements Systems Analysis and Design in a Changing World, 3rd Edition 18
8 Partial Matrix of General Requirements Systems Analysis and Design in a Changing World, 3rd Edition 19
8 Partial Matrix of Functional Requirements Systems Analysis and Design in a Changing World, 3rd Edition 20
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