1. System Analysis (Part 1)
What is a System?
What is Analysis?
System Analysis
Why would we change a System?
The System Development Life Cycle
Problem Selection and Feasibility Study

2. What is a System?
A system is a group of components working together to reach a specific goal
If one of the components are missing the system would not work the way it should
For example a car is a system made up of the body, wheels, steering wheel and an engine, if the car had no wheels it would be useless

3. What is Analysis?
Analysis is the process of studying something very closely
To analysis something we would look at ALL the different components of the system and how they work together
Analysis is like being a detective and studying EVERYTHING about the system

4. System Analysis
As the name suggests this is the processes of analysing a system very closely
System analysis is normally used when a company wishes to change their current system
A team of people would all work together to analysis the current system and come up with a better one

5. Why Change a System?
We change a system for many different reasons, some being;
Our old system is outdated
Something could go wrong with the current system
The company could grow and need a better system

6. Why do we need System Analysis?
The software we have on our home computers is very different to that used on company computers
The software is more complex hence problems that may arise are much bigger, hence it would be too difficult for one person to manage alone, we would need team of people
In order to create and maintain a software for a company there would need to be a formal plan

7. …
For this formal plan to take place the team hired by the company would have to go through a number of System Analysis steps
System analysis is essential, to plan the software and to enable members of the team to communicate during development and also afterwards.

8. System Development Life Cycle
Project Selection and Feasibility Study
Present System study and Analysis
System Design of the New System
Programming and Documentation
Implementation and Change Over
System Control and Review
System Maintenance
Analysis
Design
Implementation
Maintenance

9. Analysis
This is the over all study of the current system, looking at why we should change the system and if it is worth the change.
Project Selection and Feasibility Study
Present System Study and Analysis

10. Project Selection and Feasibility Study1
This is the very first step of System Analysis
This is the fist study of the system where the team decide if a solution is possible and how it may be done
At this stage the company would find out how long the change over would take and how much it would cost and so on

11. The Feasibility Study
This study is where the team lets the company know if it is worth them to change their system
The company would need to think of things such as;
Money
Time
Training of staff ect…

12. The Results of this Stage
Describes the context of the problem.
Contains an evaluation, or simple analysis, of the problem.
Identifies, and justifies, ways in which the problem may be solvable.
Involves a cost-benefit analysis to decide if a solution is affordable.

13. Present System Study and Analysis2
Present System Study and Analysis
This stage of analysis is the study of the system that is currently in place
At this stage the WHOLE system is studied leaving out nothing
Even the people involved in the system such as the employees are studied

14. What goes on … The following main points are analysed
How the employees work
Who is in charge of the different departments
How the employees feel about the current system
What the employees thing about change

15. How its done…
This stage of analysing the current system involves a lot of work
In order to carry out the investigations the team would use
Interviews
Questionnaires
Surveys
Observations
Group meetings ect …

16. Resistance to Change
In the stage of analysis the team would find out what the employees thing about the change
Some employees might not be keen on things being changed this could be due to
More work
Training
Technology
Job takeover
Less work ect …

17. Design General planning and building of the new system
3. System design of the new system
4. Programming and Documentation

18. 3 System Design This stage is a very long time consuming stage.
At this time the actual designing of the program is done
This is when the planning of the program is done using pseudo code, flow charts, mock ups and so on

19. The Four Design Tasks Setting what the new system should output
Deciding what the system would need as an input to create the results
What files and fields the system needs to hold the data
Setting the processing of the system (insertions, deletion, editing ect…)

20. Programming and Documentation3
Programming and Documentation
This third step is divided into two parts
The programming part = actually creating the program itself
Documentation = creating a booklet containing all the information needed about the system

21. Programming
The team would have trained programmers who would spend a lot of time actually creating the system
The programmers would use the design material created in the previous stage

22. Documentation
Documentation is a very important part of creating a new program
Documentation is written information and diagrams which helps users use the system better and it enables maintenance
Documentation consists
technical documentation
user documentation
program documentation (explained later on)