User:Rakeshdhuware

youneedawiki Assignment 5 By Dr.R.K.Dhuware

SDLC SDLC Consists of a set of development Activities that have a prescribed order. Once a problem or opportunity for a new system is recognized a request for development of system is forwarded to planners. If approved and scheduled for development, a study is conducted to ensure that the Information System is feasible. The specification of system requirements follows. Then come system design, system

implementation

, Testing, conversion & evaluation. A Recycling of development Activities may occur if problems are identified. The term “Development Cycle” is used to acknowledge the importance of recycling in meeting information needs.

 Phases Of System Development Life Cycle:-  1) Problem Recognition: Once the need for an Information System has been perceived by persons working within an organization, a request for the development of the system will be forwarded to the persons(s) in the organization responsible for planning. Ex. A development request may be initiated by a manager of a functional deptt., operational, personnel, customers or computer specialist. 2) Planning: Planners take in to consideration corporate goals, available Resources, organizational constraints, Technological Trends, and the competitive environment in which the firm operates. When deciding upon long and short- range planning objectives. A request for the development of new system that is approved by the planning committee is forwarded to corporate management. Management reviews the project and makes a decision whether or not to undertake the development of the proposed information system. When management approves the project, the development team is formed and development Activities begin.

 3) Feasibility Study :  A F—S determines whether a computerized I.S can be implemented to generate desired output given the organizational constraints. The cost of proposed system is estimated. It will also consider whether manual processing or the use electro mechanical M/CS might be more cost — effective for the production needed information.

The results of F—S are forwarded to corporate management along with recommendation to continue or discontinue the project. 1. Organizing for the study— Appoints Team for study 2. Search for solutions — Management states 3. Feasibility Analysis- _ — objectives policies 4. Choice of a solution— constraints

4) User Specification: Specifying system requirements. During this phase the information needs of users are precisely defined as systems objectives and specification for the information system under development are formulated. The system requirements statements is prepare that outlines i. Output to be produced ii. Processes to be performed iii. Inputs to be used  iv. Recourses that will be required v. Procedures to be follows Specifications must be formulated for the five basic components of computer systems (h/w, s/w, data, procedures & people), which during processing, interacts to produce desired o/p. The specification documents serves as for the design of new system.  5) System Design:  Analysts draw up a blue — print for development stating the system requirement in operational terms. The model (mathematical representation) or Algorithm to be used in problem solution is selected. The data base in designed. H/w cost, capability, speed, error rates and other performance characterization are specified. Changes to be made in the organizational structure of the firm are outlined. Input, output, files, forms and procedures are planned. Standards for documentation & system control are formulated. The product at the end of designs phase is the set of design documents that are sent to the persons responsible for system implementation. Such as programmer Analysts, Personnel responsible for h/w acquisition & installation, DBA and so on. 6) Implementation: 1. A major activity is programming. The main program(s) must. Written so that the system produces expected information. 2. Programs must be prepared for checking, storing & maintaining the data in the data base. 3. H/w selection  selection of Minis, micros & i/o equipment. 4. Site preparation, Installation of new equipment & equipment testing follow acquisition. 5. Data base organization: Collection, verification & storage of additional data. 6. System orientation of training: Employees must know how to operate & use the system when it goes online. 7. The preparation of procedures & documentation of these procedures in a procedures manual.  8. Completion of organizational Adjustments: This activity may begin before the technical design of the system has been completed. Duties of employees may be altered & the span of control of managers broadened or narrowed. (Quality control measure) 7) Testing the Solution a. The h/w on which the how system will operate b. OS that will be used c. Assembler or compiler that will produce object code d. Data to be processed e. Application s/w f. Data entry methods  g. Operation procedures