Main tasks of system analysis ? 1-study exit=sting information system 2-identify problem 3-spelify system requirement 4-asalysis decision ========= How and when guide lines ? 1.Meeting of interview 2.Document sampling and review 3.JAD (group meeting) 4.Web site Review 5.Question rest 6.observation ========== The main DFD levels used and explain? why we have to do it in *subsequent levels? 1.Context DFD 2.Level 0 ->overview level 3.Level 1 ->middle details level 4.Level 2 ->find detailed level

What are the commonly techniques /data collection techniques used by analysis ? 1.Data modeling  ERD 2.Process modeling  DFD 3.Visibility study 4.Project management 5.Prototype modeling 6.Feasibility analysis technique ======== Fact finding techniques 1.Meeting 2.Seminar  presentation 3.JAD 4.Questionnaires ======== Four complement to model system process 1.Process 2.Data flow 3.Data store 4.External entities

Why we do data dictionary ? 1.Complement document are DFD value 2.Substitute elemention data dictionary *incomplete spec in process (algorithm) *incomplete specs of Data Flow (document structure) *incomplete of spec data store (record meta data) *necessary info knowledge ( site, security, recovery) ========= Data Dictionary 1.Data store * fields * metadata  [Primary, Type, attributes] * relation 2.Data flow : *output *input *format 3.Process 4.External entity

SDLC : system analysis document 1.Back ground study 2.System objective 3.Methodology of study 4.Data gathering procedure and output The existing system The proposed system data specification Relation : 1.One to one 2.One to many 3.Many to many ERD Table name Fields Name s id Number Primary key

Design ERD system analysis 1- Programmers 4-security 5-system analysis 2- network 3-Data entry produces 6-database Data Stores H.wS.w CBIS Computer Based Information System Process Data and Knowledge workers Methods Of Process Out put information Input Data Internal Control Review /*Back-up Security / * performance economy control coffciency services

Leader Program of networking network program Data base Data processor operator Entry clerk system senior analysis junior trainee

Software Development Lifecycle (SDLC) Planning System analysis System design implementation Testing Software of delivery project budget Technical support Coding Fact Finding

Data and Information Data are raw facts about the organization and its business transactions. Most data items have little meaning and use by themselves. Information is data that has been refined and organized by processing and purposeful intelligence. The latter, purposeful intelligence, is crucial to the definition—People provide the purpose and the intelligence that produces true information.

Information Systems & Technology An information system (IS) is an arrangement of people, data, processes, communications, and information technology that interact to support and improve day-to-day operations in a business as well as support the problem-solving and decision making needs of management and users. Information technology is a contemporary term that describes the combination of computer technology (hardware and software) with telecommunications technology (data, image, and voice networks).

Front- and Back-Office Information Systems Front-office information systems support business functions that reach out to customers (or constituents). – Marketing – Sales – Customer management Back-office information systems support internal business operations and interact with suppliers (of materials, equipment, supplies, and services). – Human resources – Financial management – Manufacturing – Inventory control

Perspectives or Stakeholders System owners pay for the system to be built and maintained. System users use the system to perform or support the work to be completed. System designers design the system to meet the users’ requirements. System builders construct, test, and deliver the system into operation. Systems analysts facilitate the development of information systems and computer applications by bridging the communications gap that exists between nontechnical system owners and users and technical system designers and builders. IT vendors and consultants sell hardware, software, and services to businesses for incorporation into their information systems.

The DATA Focus System owners’ perspective – Business knowledge is the insight that is gained from timely, accurate, and relevant information. (Recall that information is a product of raw data.) System users’ perspective – Data requirements are a representation of users’ data in terms of entities, attributes, relationships, and rules. Data requirements should be expressed in a format that is independent of the technology that can or will be used to store the data. System designers’ perspective – Database schema System builders’ perspective – Database management system