System
is a collection of related parts treated as a unit where its components interact.
Business System
Is a collection of policies, procedures, methods, people, machines, and other elements that interact and enable the organization to reach its goal. Business system include marketing, personnel, production, finance and distribution elements. The important
Information system
Are collection of procedures, programs, equipment and methods that process data and make it available to management for decision making
Data
is a raw material that is processed and refined to generate information.
Information
is the product that results from processing or manipulating raw data
Open system (probabilistic systems)
are those in which the ouput or results cannot be determined precisely. These systems involve elements of chance or probability.
Closed systems
The result or output can be predicted with certainty.
System Analyst
Is a person or individual who are engaged in the broadly expanding field of systems analysis. He or she provides a key human resource in the planning, improvement and operation of business organizations.
Organizations
are made up of more than machines, offices, money and materials. The most essential ingredient in any company is its personnel. Those who whish to succeed must have certain skills, knowledge and attitude.
Consultant
frequently system analyst acts as a system consultant to a business. Such hiring can be an advantage because outside consultants can bring with them a fresh perspective that other members of an organization do not possess. It is also disadvantage because
Supporting expert
in this, the role of analyst draws on professional expertise concerning computer hardware and software and their uses in the business
Agent of change
- a person an analyst serves as a catalyst for change, develops a plan for change and works with others in facilitating that change.
System analysis
is the investigation of business or information systems. It is the scientific study of the systems process, including investigation of inputs and outputs in order to find better, more economical and more efficient means of processing.
Planning, Analysis, Design, Development, Implementation
5 phases of SDLC
Planning Phase
In this phase, an analyst recognize, diagnose, and define the problem. They may conduct study to assess the overall scope of the problem and determine whether more money and time should be expended in solving it. They prepare a plan attack and select the
Analysis phase
In this phase, the analyst reviews data and information on the in place system. He or she takes measurements, conducts audits, gathers information, interviews individuals, samples work and documents the kinds and types of information to be processed by th
Design Phase
the analyst identifies and considers alternatives. He/She will select an alternative and conceive a design. During the design phase, input and output records are prepared, forms laid out, and file specifications written. A major aspect of system design is
Implementation Phase
The last step of the cycle, the implementation phase, deals with the changeover to a new or improved system. After the facilities have been installed, programs software, and hardware must be tested to ensure that they meet design specifications. Final cha