System Analysis
A
system analysis team is often
brought in to review an existing system and suggest a number of improvements.
The existing method used may be either a manual paper-based system or a
computer-based operation that is no longer regarded as adequate for the task.
The
systems that we are talking about are the systems within organizations and
businesses - systems of communication, financial systems, manufacturing
systems, etc. - basically the systems that make the organization or business
work.
Example of
System Analysis:
Paper Based System
Paper based system is a manual
system that some companies still use nowadays. Even though there is a computer,
some still take advantage of paper system rather than trusting the computers.
Advantages:
- Easy to use
- Cost saving
- They do not crash like computers do
Disadvantages:
- Limited by physical storage space available
- Very difficult to analyze the data
- Records can be lost or misfiled
Computer Based System
Computer based system is an
information system that is based on computer hardware and software technology
for processing and disseminating information.
Advantages:
- Can hold a vast amount of data
- The database can be kept secure by use of passwords
- Records are stored safely
Disadvantages:
- Computers may crash
- Depends on electricity
- More expensive than paper-based system because it requires electricity
Analysis Stage
Analysis
stage is the stage where current system is looked in detail in order to figure
out what changes need to be made to improve the system. Below are the steps:
- Collecting data from the current system
- Identifying the description of the current system
- Figuring out the problems with the current system
- Solving the problems
- Identify the requirements of the new system
- Producing a cost-benefit analysis
- Producing a data flow diagram
There are four methods in order to
find the facts:
Questionnaires
Questionnaires are research instrument consisting of a series of
questions for users to complete.
Advantages:
- Practical
- Large amount of information can be gathered
- Results can be checked quickly
Disadvantages:
- Lacks validity
- Nobody knows whether the respondent is honest while filling in the questionnaire
- Different questions interpretation
Observation
Observation
is the process of observing something or someone carefully or in order to gain
information.
Advantages:
- Not expensive
- A very direct method
- Problem of depending on respondents is decreased
Disadvantages:
- Problems of the past cannot be studied
- Attitudes cannot be studied
- More time is wasted
Interviews
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.
Advantages:
- Time and cost saving
- Sufficient information collected
- Depth analysis occurs
Disadvantages:
- Lack of attention
- No record/evidence
- Interviewer’s biases
Looking At Existing Paper Works
The existing paper works include the
information needed to improve to a better new system. Data are recorded to be
analyzed to do the improvements needed.
Advantage:
- Complete record of data about the current system
Disadvantages:
- Time consuming
- Very expensive
Design Stage
Design
is the second stage after the analysis stage is clear. It doesn’t matter what
type of design is created. What is important is a clear design. Below are the
steps:
- Designing data entry forms/input forms
- Designing screen layouts
- Designing printed outputs/reports
- Producing system flowcharts
- Designing data validation methods
- Designing structures to store data
- Selecting and designing hardware and software requirements
- Designing data verification methods
- Designing a testing strategy/plan
More depth
two of these tasks are:
Verification
Verification is the act of reviewing,
inspecting or testing, in order to establish and document that a product,
service or system meets regulatory or technical standards.
Two common
ways of verification checks:
- Double Entry
In this method, data is entered twice,
using two different people. The computer compares the two entries, either after
data entry or during the data entry process, and identifies any differences.
- Visual Check
Checking for
errors by comparing entered data on the screen with the data in the original
document
Validation
Validation is to check the accuracy
of the system. It is also to check to see if it satisfies certain criteria when
input into a computer.
Types of
Validation Checks:
References:
Thank you for reading this blog.
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