ITFT - System development life cycle models

ITFT - System development life cycle models

• 1.
  System development life cycle
• 2.
  Definition of sDLC •Using the system approach to develop information system solutions involves a multistep process known as SDLC.
• 3.
  Phase of SDLC •Investigation • Analysis • Feasibility Study • Design • Construction • Testing • Implementation & Maintenance
• 4.
  Phase of SDLC
• 5.
  SYSTEMS INVESTIGATION • Understandthe business problem or opportunity • Determine whether a business problem or opportunity exists. • The goal of feasibility study is to evaluate alternative system and to purpose the most feasible and desirable system for development.
• 6.
  Feasibility study • Thereare basically five types of feasibility are addressed in the study. 1. Technical feasibility 2. Economic feasibility 3. Motivational feasibility 4. Schedule feasibility 5. Operational feasibility
• 7.
  System analysis It isan in-depth study of end user information needs that produces functional requirements that are used as the basis for the design of a new information system. System involves detailed study of: a. The information needs of the organization and end user. b. The activities, resources and products of any present information system. c. The information system capabilities required to meet your Information needs
• 8.
  System design • Systemdesign can be viewed as the design of user interface, data, process and system specification. System Design User interface design Data design Process design System specification design
• 9.
  System Construction • Therequired programs are coded, debugged, and documented. The system should be tested with some test data to ensure its accuracy and reliability.
• 10.
  System Implementation • Theimplementation is a vital step in ensuring the success of new systems. Even a well designed system can fail if it is not properly implemented.
• 11.
  System maintenance • Oncea system is fully implemented and being operated by end user, the maintenance function begins. Systems maintenance is the monitoring,evaluating and modifying of operational information system to make desirable or necessary improvements.