Systems analysis is the study of computer systems analysis. It is also "an explicit formal inquiry carried out to help    the decision maker identify a better course of action and make a better decision than he might otherwise have made."
Analysis is defined as the procedure by which we break down an intellectual or substantial whole into parts. Systems analysis researchers apply methods to the analysis of systems involved to form an overall picture.
When a computer-based information system is developed, systems analysis would constitute the following steps:

• The development of a feasibility study, involving determining whether a project is economically, socially, technologically and organizationally feasible.
• Conducting fact-finding measures, designed to ascertain the requirements of the system's end-users.
• Gauging how the end-users would operate the system (in terms of general experience in using computer hardware or software), what the system would be used for etc.

Our body is itself a system. A business is also a system. People, money, machine, market and material are the components of business system that work together that achieve the common goal of the organization.
Computers are fast becoming our way of life and one cannot imagine life without computers in today's world. Computers are used in every possible field today, it becomes an important issue to understand and build these computerized systems in an effective way.
Building such systems is not an easy process but requires certain skills and capabilities to understand and follow a systematic procedure towards making of any information system. For this, experts in the field have devised various methodologies.
Software Engineering is the systematic approach to the development, operation and maintenance of software. Software Engineering is concerned with development and maintenance of software products.
The primary goal of software engineering is to provide the quality of software with low cost. Software Engineering involves project planning, project management, systematic analysis, design, validations and maintenance activities.
A collection of components that work together to realize some objectives forms a system. Basically there are three major components in every system, namely input, processing and output.
Computer Applications
In a system the different components are connected with each other and they are interdependent. For example, human body represents a complete natural system. We are also bound by many national Systems such as political system, economic system, educational system and so forth. The objective of the system demands that some output is produced as a result of processing the suitable inputs. A well-designed system also includes an additional element referred to as ‘control' that provides a feedback to achieve desired objectives of the system.
System life cycle is an organizational process of developing and maintaining systems. It helps in establishing a system project plan, because it gives overall list of processes and sub-processes required for developing a system.
Systems analysis is a process of collecting factual data, understand the processes involved, identifying problems and recommending feasible suggestions for improving the system functioning. This involves studying the business processes, gathering operational data, understand the information flow, finding out bottlenecks and evolving solutions for overcoming the weaknesses of the system so as to achieve the organizational goals. System Analysis also includes subdividing of complex process involving the entire system, identification of data store and manual processes.
Maintenance of systems is necessary to eliminate errors in the system during its working life and to tune the system to any variations in its working environments.