System Design
1. System Model:
A
logical or mathematical representation of a system is known as system model.
Model
can be built for the existing system to better understand the proposed system.
2. Process Modelling:
Process
modelling is technique which involves graphical representation of functions or
processes that capture , manipulates, stores or distribute data between a
system & its environment or among components within a system. DFD(Data Flow
Diagram) is one of the common form of process model.
3. Logical & Physical design:
System
design involves two categories-
a. Logical design:
It
is concerned with the specification of major features of the system that would
meet the objectives. The delivered product of logical design may be called as a
blueprint of a new system.
Logical
design of a system includes content requirements and some of following
components-
i.
Output(Reports & Displays)
ii.
Input forms
iii.
Procedures(Structured of procedures to collect,
transforms & output data)
iv.
Storage(Requirements for data to be stored in the
database)
v.
Control(Requirements for data integrity, security
& procedure for recovery)
b. Physical design:
It
requires logical design or blueprint and produces the program specification,
physical files or database definitions. It also includes user interface design
and selects hardware & software packages.
4. Input Output Design:
a. Input Design:
Part
of the system which deals with the design of the interface through which user
communicates with the system and feeds the input data to the system.
b. Output Design:
The
part of the system which deals with determining how the output is to be
presented, in what format or shape is known as output design of the system.
Computer produces displays and print reports that are to be read and used by
users therefore the output must be clear and easy to understand.
c.
I/O Forms:
It
is primary carrier for data or information. They are the user requests for some
action. A properly designed form is necessary for efficient functioning of a
system.
Form
is used to –
i.
To obtain information efficiently
ii.
Distributes information easily
iii.
Store information effectively and economically
Types of Forms:
1. Action
Form:
This
type of form requests the user to perform certain actions and they are
generally moves from one person to organisation or another person.
2. Memory
Form:
It
record historical data such as stock ledger, purchase record, bond form.
3. Report
Form:
It
provides summarised information. These are generally used by managers and such
people who are required to make decision making. They guide supervisors and
administrators for decision making.
Form designing:
Steps
for form designing-
i.
Define the purpose of form
ii.
Specify its data contents
iii.
Using a guide sheet enter title, form number and
indicates position of any specially located material
iv.
Review with the user & revised if necessary
v.
Create few test forms.
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