The systems life cycle

Analysis is all about looking at how a job is done at present and seeing if the job could be done better or more efficiently by upgrading or developing a new system.

Feasibility Study
For any project, the feasibility study will examine how realistic the proposed solution is, to meet the aims of the project. It will also compare and contrast the options put forward to complete the project. This is a relatively cheap way of checking that the project will succeed before a lot of money and time is spent on it.

INTERVIEW,QUESTIONNAIRE, OBSERVATION
An interview is a conversation between two or more people where questions are asked by the interviewer to elicit facts or statements from the interviewee.
A questionnaire is a research instrument consisting of a series of questions and other prompts for the purpose of gathering information from respondents.
Observation is either an activity of a living being, such as a human, consisting of receiving knowledge of the outside world through the senses, or the recording of data using scientific instruments.

Process
Input
Data
system
Documentations
Teachers
Output
Order
Stability of System

Needs
Data can be mislaid;
It’s too slow to find data;
It takes a lot of places in the office.
Problems
Users need stable, useful system to storing all the data.

A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modeling its process aspects.
A process flow diagram (PFD) is a diagram commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment.