OBJECTIVES:- - Define system development and list the system development phases - Identify the guidelines for system development - Discuss the importance of project management, feasibility assessment, documentation, and data and information gathering techniques - Explain the activities perform in the planning phases - Discuss the purpose of the activities perform in the analysis phase - Describe the various tools used in process modelling - Describe the various tools used in object modelling - Explain the activities perform in design phases - Recognize the develop programs activity is part of system development - Discuss the activities performed in the implementation phase -Discuss the purpose of the activities performed in the operation, support, and security phases System development -A set of activities used to build information system Phases = Planning --> Analysis --> Design --> Implementation --> Management Guidelines = Group activities or tasks into phases, Involve users, and Define standards Project Management - The process of managing activities during development. For ex, project scope, required activities, times estimation, estimates cost, order of activities, activities that can take place at the same time Feasibility - A measure of how suitable the development of a system will be to the organization -Operational, Schedule, Technical, Economic feasibility Documentation -The collection and summarization of data and information Data and Information gathering techniques:- -Review documentation -Observe -Survey -Interview -JAD sessions -Research Planning Phases: -A project to begins when the steering committee receives project request - Review and approve the project request --> Prioritize the request --> Allocate resources --> Form a project development team Analysis Phases: -Two major activities: Preliminary investigation, Perform detail analysis -Preliminary investigations determine and defines the exact nature of the problem or improvement -Perform detail analysis study how the system work, determine the user's requirement, and recommend a solution Process modelling -An analysis and design technique that describes processes that transform input to outputs -Entity-relationship diagrams, data flow diagram, project dictionary Object modelling -Combines data with the processes that act on the data into a single unit, called an object Design Phases -Two major activities: Acquire hardware and software, Develop all the details of the new or modified information system. -Database design, Input and output design, Program design. Prototype -A working model of the proposed system Implementation Phases -Construct the new or modified system and then deliver it Develop programs --> Install and test the new system --> Train users --> Convert the new system - Various test needed : Unit test, Systems test, Integration test, Acceptance test Operation, Support, Security Phases
- To provide ongoing assistance for an information system and its users after the system is implemented Perform maintenance --> Monitor system performance --> Access system security -Computer security plan - Identify all information assets of an organization - Identify all security risks that may cause an information asset loss -For each risk, identify the safeguards that exist to detect, prevent, and recover from a loss
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