What is system development ?
System development is a set of
activities used to build an information system.
How to operate system development
:-
- · Planning- select team , Resource
- · Analysis- user requirement
- · Design- design layout
- · Implementation- testing the system
- · Operation, Support and Security-maintenance , check security, monitor performance.
Project management is the process of planning,
scheduling, and then controlling the activities during system development.
Documentation is the collection and summarization
of data and information.
The
planning phase
for a project begins when the steering committee receives a project request.
The
analytic phase consist two major activates
:-
· Conduct a preliminary investigation
· Perform detailed analysis
Process modeling (structured analysis and
design) is an analysis and design technique that describes processes that
transform inputs into outputs.
An
entity-relationship
diagram (ERD) is a tool that graphically shows the connections
among entities in a system.
A
data flow diagram
(DFD) is a tool that graphically shows the flow of data in a system
· Data
flows
· Processes
· Data
stores
· Sources
The
project dictionary
contains all the documentation and deliver able of a project.
A
decision table is a table that lists a variety of conditions and the
actions that correspond to each conditions.
The
data dictionary
stores the data item’s name, description, and other details about each data
item.
Object modeling combines the data with the
processes that act on that data into a single unit, called an object.
UML (Unified Modeling Language) has been adopted as a
standard notation for object modeling and development.
A
use case diagram
graphically shows how actors (users) interact with the information system.
A
class diagram
graphically shows classes and subclasses in a system.
A
prototype
(proof of concept) is a working model of the proposed system
· Prototypes
have inadequate or missing documentation
· Users
tend to embrace the prototype as a final system
· Should
not eliminate or replace activities
The
purpose of the implementation
phase
is to construct the new or modified system and then deliver it.
Training involves showing users
exactly how they will use the new hardware and software in the system :-
· One-on-one
sessions
· Classroom-style
lectures
· Web-based
training
The
purpose of the operation,
support, and security phase is to provide ongoing
assistance for an information system and its users after the system is
implemented.
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