Building the MIS System Concepts System Development Life

Building the MIS System Concepts (System Development Life Cycle) 1

A System Ú Consists of elements which operate together according to some procedures and within some boundaries to achieve a particular goal Ú The basic model is input, process and output. 2

Control The Organization as a System: Input • Manager • Money • Materials • Machines • + Information Organization The Computer MIS Measure performance against plan • Plans • Programs • Policies • Strategies • External Control Output • Goals/Objectives • Profitability • Productivity • Growth • Innovation • Employee • Development

Three stages of systems approach Ú Definition – Understand the business problem or opportunity. Ú Development – Develop an information system solution. Ú Installation and operation – Implement the information system solution. 4

Definition Ú Feasibility Study Ú Requirements Collection and Analysis Ú Conceptual Design 5

Development Ú Design – Physical system design • Input design • Output design – Physical database design • File design • Database design – Program Development – Procedure Development 6

Installation and Operation Ú Conversion Ú Operation and Maintenance Ú Post audit 7

Journey of a “System” in its Development Cycle 8

System Development life Cycle (SDLC) Ú It holds that systems are best developed through the use of a systematic development approach. Ú The systems development life cycle (SDLC) is a conceptual model used in project management Ú It describes the stages involved in an information system development project, from an initial feasibility study through maintenance of the completed application. 9

Steps in SDLC Analyze Investigate Maintain Developing System Solutions Design Implement 10

System Investigation Ú Following are three activities in this stage: – System planning and selection – Feasibility study – Feasibility report Ú There are four types of feasibilities: – Organizational – Economic – Technical – Operational 11

System Analysis Ú Following are the four activities in this stage: – Analysis of the organizational environment – Analysis of any present systems – System requirement analysis – System requirements report 12

System Design Ú System design can be viewed as the design of – User interface design (Screen, form, reports and dialog design) – Data design (Data element structure design) – Process design (Program and procedure design) 13

System Implementation Ú It involves – Hardware and software acquisitions – Software development – Testing of programs and procedures – User training – Development of documentation – Various installation activities 14

System Maintenance Ú It involves – Monitoring – Evaluating – Modifying of a system to make desirable or necessary improvements Ú It also includes post-implementation review process for any new requirement. 15

Final SDLC Maintenance Cycle Testing Cycle Systems Investigations Product: Feasibility Study Systems Analysis Product: System Requirements Systems Design Product: System Specifications Systems Implementations Systems Maintenance Product: Operational System Product: Improved System 16