The document discusses the system development life cycle (SDLC), which consists of 7 phases: 1) Preliminary Investigation, 2) System Analysis, 3) System Design, 4) System Coding, 5) System Testing, 6) System Implementation, and 7) System Maintenance. The first phase involves initial analysis and identification of the system. System analysis then studies the current system in detail to understand how it works and identify improvements. Following this, system design develops the logical and physical models of the new system. System coding writes the programs, which are then tested in unit and system testing before implementation, where the new system is deployed. System maintenance ongoing ensures the system continues to function properly.

1. BS(Information Technology)

2. SYSTEM DEVELOPMENT LIFE CYCLE

3. SDLC stand for system development life cycle. It
is a set of different steps that are performed to
develop a system

4. 1. Preliminary Investigation
2. System Analysis
3. System Design
4. System Coding
5. System Testing
6. System Implementation
7. System Maintenance

6. Preliminary investigation is the first phase. The
system is investigated the initial analysis and
finding of system.
 System Identification
 System Scope
 Alternative Solutions
 Feasibility Study
 Preliminary Plan

7.  System Identification:-
Everything performed in future
depends on this phase.
 System Scope:-
The scope of a system can be reduced
due to financial and political problems .
 Alternative Solutions:-
If is used to select the best
solution that fulfills the requirements.
 Feasibility Study:-
The decision depends on different
issues such as financial and time limits.
 Preliminary Plan:-
They may accept, modify or reject
the report.

8. Studied in detail to find out how it works and
how to improve it
 Need Analysis
 Data Gathering
 Data Analysis
 Analysis Report

9.  Need Analysis:-
It consists of all requirements of the system from user and
managers
 Data Gathering:-
This is used to collect detailed information about system.
a. Written Documents
b. Interviewing
c. Questionnaires
d. Observation
e. Sampling
 Data Analysis:-
It is a process of analyzing the data to obtain accurate
information tool (flow diagram and flow chart)
 Analysis Report:-
a. It must explain the current system.
b. It should explain the problems in the current system.
c. It should describe the requirements and recommendations for new system.

10. System design phase is used to design the
logical and physical model of new system.
 Logical Design
 Physical Design

11.  Logical Design:-
It reviews the system
requirements and considers major system
components, case tools and project management
software Tool (MS Project and Gantt Chart)
 Physical Design:-
a. Output requirements
b. Input requirements
c. Storage requirements
d. Processing requirements
e. System control
f. Backup and recovery procedures

12. This phase consists of writing programs for the
system. Single programmer or a team of
programmers develops the system using
different tools

13.  Unit Testing
 System Testing

14.  Unit Testing:-
Individual units or modules
of the system are tested by using sample
data.
 System Testing:-
In this stage all modules
or units are combined to make a complete
system (whole)

15. A System can be implemented after I has been
tested. It is also known as system conversion.
 Parallel Conversion
 Pilot Conversion
 Phased Conversion
 Direct Conversion

16.  Parallel Conversion:-
A type of conversion in which both new
and old systems operate together for a period of time is called
PC
 Pilot Conversion:-
In the type of conversion, one part of the
organization uses the new system and for the reset of the
organization uses the old system.
 Phased Conversion:-
A type of conversion in which individual
components of new system are implemented one by one is
called PC
 Direct Conversion:-
The old system is directly replaced by
the new system. It is the most risky conversion , but used when
time short

17. It is a process of checking the work in of the
system. It is very important to ensure that the
system is fulfilling.
 Correcting the problems in the system
 Updating the system to fulfill new
requirement
 Improving the working of the system etc.

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