The System Development Life Cycle (SDLC) describes the stages of a software development project. It involves planning, analysis, design, implementation, testing, and maintenance. In the analysis stage, tools like interviews and documentation are used to understand business needs. The design stage separates logical design, which specifies user needs, from physical design, which specifies how the system will function. Testing occurs at the unit, integration, and system levels to ensure quality before implementation. Post-implementation review evaluates whether the new system meets requirements.

1. System Development Life
Cycle(SDLC)

2.  A frame work that describe the activities
performed at each stage of software
development project

4.  It can be environmental based or organizational based.
 Ideas are generated to advance technology.
 User originated ideas prompt initial investigation.

5.  Economic: Cost benefit analysis.
 Technical: We need to check whether existing computer
can support the system.
 Behavioral: An estimate should be made of how strong a
reaction the user staff is likely to have toward the
development of a computerized system.

6.  Form a project team and appoint a leader.
 Prepare System flowcharts.
 Describe and identify characteristics of candidate system.
 Evaluate performance.
 Select best candidate system.

7.  In the Analysis stage an in-depth analysis is performed to
obtain a detailed understanding of the business needs.
 Tools Used: DFD’s, interviews, on-site observation,
questionnaire etc.
 Training, experience and common sense are required for
collecting information to do analysis.

8.  Two phases:
 Logical Design: Specifies user needs(mental work).
 Physical Design: Tells the programmer what the
candidate system must do (usually paper work).

9.  The objective of coding phase is to transform the design
of system in to code in a high-level language using coding
standards.

10.  three type of testing;
 Unit testing
 One by one each code(modules)
 Integration testing
 Individual software modules as a group
 System testing
 testing conducted on a complete, integrated system to evaluate the system's
compliance with its specified requirements.

11.  judge the client knowledge about software.
 User personnel's are trained to operate the system

12.  It is of 3 types:
1. replace a manual system.
2. A new computer system to replace an existing one.
3. modified application to replace existing one on same
computer.

13.  The Post-Implementation Review is used to evaluate the
effectiveness of the system.
 The objectives are to determine if the system does what it
is designed to do
 Does it support the user as required in an effective and
efficient manner
 The review should assess how successful the system is in
terms of functionality, performance, and cost versus
benefits

14.  This phase is to ensure :
 that needs continue to be met and that the system
continues to perform according to specifications.
 Routine hardware and software maintenance and
upgrades .
 User training continues during this phase, as needed, to
acquaint new users to the system or to introduce new
features to current users.

15.  What is feasibility?
 Why analysis is required?
 Difference b/w physical & logical design?